diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ba077a4
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+bin
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..473edf4
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,339 @@
+GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
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+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
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+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
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+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
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+
+  Finally, any free program is threatened constantly by software
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+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
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+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
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+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
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+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
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+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
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+distribute the same sections as part of a whole which is a work based
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+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
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+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
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+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
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+
+  5. You are not required to accept this License, since you have not
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+prohibited by law if you do not accept this License.  Therefore, by
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+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+  6. Each time you redistribute the Program (or any work based on the
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+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
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+license would not permit royalty-free redistribution of the Program by
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+
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+
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+
+This section is intended to make thoroughly clear what is believed to
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+
+  8. If the distribution and/or use of the Program is restricted in
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+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
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+countries not thus excluded.  In such case, this License incorporates
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+
+  9. The Free Software Foundation may publish revised and/or new versions
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+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
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+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
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+
+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
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+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
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+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
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+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    zx2c4 pass manager addon for firefox
+    Copyright (C) 2013  Johan Venant
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  {signature of Ty Coon}, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..2599473
--- /dev/null
+++ b/README.md
@@ -0,0 +1,88 @@
+passff-host
+===========
+
+[![Join the chat at https://gitter.im/jvenant/passff](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/jvenant/passff?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
+Host app for the WebExtension **[PassFF](https://addons.mozilla.org/firefox/addon/passff)**
+
+### Overview
+This piece of software wraps around the **[zx2c4 pass](http://www.zx2c4.com/projects/password-store/)** shell command. It has to be installed for the PassFF browser extension to work properly.
+
+### Installation
+Download the `install_host_app.sh` script from [our releases page](https://github.com/passff/passff-host/releases) and execute it. You can do this in one line like so:
+
+```
+$ curl -sSL https://github.com/passff/passff-host/releases/download/1.0/install_host_app.sh | bash -s -- [firefox|chrome|opera|chromium|vivaldi]
+```
+
+This script will download the host application (a small python script) and the add-on's manifest file (a JSON config file) and put them in the right place.
+If you're concerned about executing a script that downloads files from the web, you can download the files yourself and run the script with the `--local` option instead or link the files yourself. Details below.
+
+#### Windows
+Download the `install_host_app.bat` script from [our releases page](https://github.com/passff/passff-host/releases) and execute it from within a shell with a correct PATH.
+*The rule of thumb is: if you can execute pass and python from your shell, then your host application will be installed correctly.*
+
+```
+> install_host_app.bat [firefox|chrome|opera|chromium|vivaldi]
+```
+
+Note: Older Windows versions might require powershell to be installed manually as the install script uses powershell internally. Windows 10 users should be fine out of the box.
+
+#### Latest from GitHub
+This is not recommended! Only for developers and for testing purposes!
+
+Clone the repository. Then, from the project's `src/` directory, run `make` and execute the installation script in `bin/testing` for your desired browser (`firefox`, `chrome`, `opera`, `chromium`, or `vivaldi`):
+
+```
+$ cd ./src
+$ make
+$ cd ../bin/testing
+$ ./install_host_app.sh --local [firefox|chrome|opera|chromium|vivaldi]
+```
+
+This will copy the host application and manifest files to the right place for your browser. The `--local` option makes the script use the files on disk rather than downloading them from GitHub.
+
+If this doesn't work, you can link the files yourself. First, change the `path` value in the `passff.json` file to be the absolute path to the project's `bin/testing/passff.py` file. Then symlink (or copy) the file `bin/testing/passff.json` to the appropriate location for your browser and OS:
+
+- Firefox
+  - Linux
+    - Per-user: `~/.mozilla/native-messaging-hosts/passff.json`
+    - System-wide: `/usr/{lib,lib64,share}/mozilla/native-messaging-hosts/passff.json`
+  - OS X
+    - `/Library/Application Support/Mozilla/NativeMessagingHosts/passff.json`
+  - Windows
+    - Per-user: `Path contained in registry key HKEY_CURRENT_USER\Software\Mozilla\NativeMessagingHosts\passff`
+    - System-wide: `Path contained in registry key HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\NativeMessagingHosts\passff`
+- Chrome
+  - Linux
+    - Per-user: `~/.config/google-chrome/NativeMessagingHosts/passff.json`
+    - System-wide: `/etc/opt/chrome/native-messaging-hosts/passff.json`
+  - OS X
+    - Per-user: `~/Library/Application Support/Google/Chrome/NativeMessagingHosts/passff.json`
+    - System-wide: `/Library/Google/Chrome/NativeMessagingHosts/passff.json`
+  - Windows
+    - Per-user: `HKEY_CURRENT_USER\SOFTWARE\Google\Chrome\NativeMessagingHosts\passff`
+    - System-wide: `HKEY_LOCAL_MACHINE\SOFTWARE\Google\Chrome\NativeMessagingHosts\passff`
+- Chromium
+  - Linux
+    - Per-user: `~/.config/chromium/NativeMessagingHosts/passff.json`
+    - System-wide: `/etc/chromium/native-messaging-hosts/passff.json`
+  - OS X
+    - Per-user: `~/Library/Application Support/Chromium/NativeMessagingHosts/passff.json`
+    - System-wide: `/Library/Application Support/Chromium/NativeMessagingHosts/passff.json`
+- Opera
+  - Same as Chrome
+- Vivaldi
+  - Linux
+    - Per-user: `~/.config/vivaldi/NativeMessagingHosts/passff.json`
+    - System-wide: `/etc/vivaldi/native-messaging-hosts/passff.json`
+  - OS X
+    - Per-user: `~/Library/Application Support/Vivaldi/NativeMessagingHosts/passff.json`
+    - System-wide: `/Library/Application Support/Vivaldi/NativeMessagingHosts/passff.json`
+
+### Preferences
+By modifying the `preferences section` in `passff.py` you will be able to set
+  - the path to the `pass` script,
+  - additional command line arguments that are passed to `pass`,
+  - the shell `stdout` charset,
+  - additional environment variables.
diff --git a/src/Makefile b/src/Makefile
new file mode 100644
index 0000000..0752a3a
--- /dev/null
+++ b/src/Makefile
@@ -0,0 +1,34 @@
+
+VERSION := testing
+
+SRC_DIR := .
+TARGET_DIR := ../bin/$(VERSION)
+
+INSTALL_WIN_FILE := install_host_app.bat
+INSTALL_WIN_SRC := $(SRC_DIR)/$(INSTALL_WIN_FILE)
+INSTALL_WIN_TARGET := $(TARGET_DIR)/$(INSTALL_WIN_FILE)
+
+INSTALL_UNIX_FILE := install_host_app.sh
+INSTALL_UNIX_SRC := $(SRC_DIR)/$(INSTALL_UNIX_FILE)
+INSTALL_UNIX_TARGET := $(TARGET_DIR)/$(INSTALL_UNIX_FILE)
+
+HOST_APP_FILES := passff.py passff.json
+HOST_APP_SRC := $(addprefix $(SRC_DIR)/,$(HOST_APP_FILES))
+HOST_APP_TARGET := $(addprefix $(TARGET_DIR)/,$(HOST_APP_FILES))
+
+HOST_TARGETS := $(INSTALL_WIN_TARGET) $(INSTALL_UNIX_TARGET) $(HOST_APP_TARGET)
+
+all: $(HOST_TARGETS)
+
+%/.d:
+	mkdir -p $(@D)
+	@touch $@
+
+$(HOST_TARGETS): $(TARGET_DIR)/%: $(SRC_DIR)/% $(TARGET_DIR)/.d
+	cp $(SRC_DIR)/$* $@
+	sed -i "s/_VERSIONHOLDER_/$(VERSION)/g" $@
+
+clean:
+	rm -rf $(TARGET_DIR)
+
+.PRECIOUS: %/.d
diff --git a/src/install_host_app.bat b/src/install_host_app.bat
new file mode 100644
index 0000000..d28d43d
--- /dev/null
+++ b/src/install_host_app.bat
@@ -0,0 +1,109 @@
+@ECHO OFF
+SETLOCAL
+
+SET "APP_NAME=passff"
+SET "VERSION=_VERSIONHOLDER_"
+SET "HOST_URL=https://github.com/passff/passff-host/releases/download/%VERSION%/passff.py"
+SET "MANIFEST_URL=https://github.com/passff/passff-host/releases/download/%VERSION%/passff.json"
+
+SET "TARGET_DIR=%APPDATA%\%APP_NAME%"
+SET "HOST_MANIFEST=%APP_NAME%.json"
+SET "HOST_SCRIPT=%APP_NAME%.py"
+SET "HOST_BATCH=%APP_NAME%.bat"
+
+SET "HOST_MANIFEST_FULL=%TARGET_DIR%\%HOST_MANIFEST%"
+SET "HOST_SCRIPT_FULL=%TARGET_DIR%\%HOST_SCRIPT%"
+SET "HOST_BATCH_FULL=%TARGET_DIR%\%HOST_BATCH%"
+
+SET "USE_LOCAL_FILES="
+SET "TARGET_REG="
+
+REM check prerequisites: is python installed & in path?
+python --version >NUL 2> NUL || (
+    ECHO "python not found in PATH. Please execute this command in a shell where python is in PATH"
+    EXIT /B
+)
+
+:loop
+IF NOT "%1"=="" (
+    IF "%1"=="--local" (
+        SET "USE_LOCAL_FILES=true"
+        SHIFT
+    ) ELSE IF "%1"=="--help" (
+        GOTO :help
+    ) ELSE IF "%1"=="firefox" (
+        SET "TARGET_REG=HKCU\SOFTWARE\Mozilla\NativeMessagingHosts\%APP_NAME%"
+        SHIFT
+    ) ELSE IF "%1"=="chrome"  (
+        SET "TARGET_REG=HKCU\Software\Google\Chrome\NativeMessagingHosts\%APP_NAME%"
+        SHIFT
+    ) ELSE IF "%1"=="chromium"  (
+        ECHO Chromium registry key location for Native Messaging Hosts is undocumented. Assuming key for Chrome. Please provide feedback if this worked: https://github.com/passff/passff/issues/202
+        SET "TARGET_REG=HKCU\Software\Google\Chrome\NativeMessagingHosts\%APP_NAME%"
+        SHIFT
+    ) ELSE IF "%1"=="opera"  (
+        ECHO Opera registry key location for Native Messaging Hosts is undocumented. Assuming key for Chrome. Please provide feedback if this worked: https://github.com/passff/passff/issues/202
+        SET "TARGET_REG=HKCU\Software\Google\Chrome\NativeMessagingHosts\%APP_NAME%"
+        SHIFT
+    ) ELSE IF "%1"=="vivaldi"  (
+        ECHO Vivaldi registry key location for Native Messaging Hosts is undocumented. Assuming key for Chrome. Please provide feedback if this worked: https://github.com/passff/passff/issues/202
+        SET "TARGET_REG=HKCU\Software\Google\Chrome\NativeMessagingHosts\%APP_NAME%"
+        SHIFT
+    ) ELSE (
+        SHIFT
+    )
+    GOTO :loop
+)
+
+IF "%TARGET_REG%"=="" (
+    GOTO :help
+)
+
+IF EXIST "%TARGET_DIR%" (
+    dir /AD "%TARGET_DIR%" > nul || (
+        ECHO "%TARGET_DIR%" is not a directory
+        EXIT /B
+    )
+) ELSE (
+    MKDIR "%TARGET_DIR%" 2> nul
+)
+
+IF "%USE_LOCAL_FILES%"=="true" (
+    IF NOT EXIST "%~dp0%HOST_MANIFEST%" (
+        ECHO local file "%~dp0%HOST_MANIFEST%" not found
+        EXIT /B
+    )
+    IF NOT EXIST "%~dp0%HOST_SCRIPT%" (
+        ECHO local file "%~dp0%HOST_SCRIPT%" not found
+        EXIT /B
+    )
+    COPY /Y "%~dp0%HOST_MANIFEST%" "%HOST_MANIFEST_FULL%"
+    COPY /Y "%~dp0%HOST_SCRIPT%" "%HOST_SCRIPT_FULL%"
+) ELSE (
+    powershell -Command "(New-Object Net.WebClient).DownloadFile('%HOST_URL%', '%HOST_SCRIPT_FULL%')"
+    powershell -Command "(New-Object Net.WebClient).DownloadFile('%MANIFEST_URL%', '%HOST_MANIFEST_FULL%')"
+)
+
+powershell -Command "(Get-Content '%HOST_MANIFEST_FULL%') -replace 'PLACEHOLDER', '%HOST_BATCH_FULL:\=/%' | Set-Content '%HOST_MANIFEST_FULL%'"
+
+(
+    ECHO @ECHO OFF
+    ECHO SET "PATH=%PATH%"
+    ECHO SET "GNUPGHOME=%GNUPGHOME%"
+    ECHO python "%HOST_SCRIPT_FULL%"  %%*
+)>"%HOST_BATCH_FULL%"
+
+REG ADD "%TARGET_REG%" /ve /d "%HOST_MANIFEST_FULL%" /f || (
+    ECHO Adding key to registry failed - maybe you need Administrator rights for this. Please run
+    ECHO REG ADD "%TARGET_REG%" /ve /d "%HOST_MANIFEST_FULL%" /f
+    ECHO manually in an administrative shell.
+)
+EXIT /B
+
+:help
+ECHO Usage: %0 [OPTION] [chrome^|chromium^|firefox^|opera^|vivaldi]
+ECHO
+ECHO Options:
+ECHO   --local    Install files from disk instead of downloading them
+ECHO   --help     Show this message"
+EXIT /B
diff --git a/src/install_host_app.sh b/src/install_host_app.sh
new file mode 100755
index 0000000..79f468c
--- /dev/null
+++ b/src/install_host_app.sh
@@ -0,0 +1,129 @@
+#!/usr/bin/env bash
+
+# This script is derived from `install.sh` in Danny van Kooten's "browserpass":
+# https://github.com/dannyvankooten/browserpass
+
+set -e
+
+APP_NAME="passff"
+VERSION="_VERSIONHOLDER_"
+HOST_URL="https://github.com/passff/passff-host/releases/download/$VERSION/passff.py"
+MANIFEST_URL="https://github.com/passff/passff-host/releases/download/$VERSION/passff.json"
+
+# Find target dirs for various browsers & OS'es
+# https://developer.chrome.com/extensions/nativeMessaging#native-messaging-host-location
+# https://wiki.mozilla.org/WebExtensions/Native_Messaging
+if [ $(uname -s) == 'Darwin' ]; then
+  if [ "$(whoami)" == "root" ]; then
+    TARGET_DIR_CHROME="/Library/Google/Chrome/NativeMessagingHosts"
+    TARGET_DIR_CHROMIUM="/Library/Application Support/Chromium/NativeMessagingHosts"
+    TARGET_DIR_FIREFOX="/Library/Application Support/Mozilla/NativeMessagingHosts"
+    TARGET_DIR_VIVALDI="/Library/Application Support/Vivaldi/NativeMessagingHosts"
+  else
+    TARGET_DIR_CHROME="$HOME/Library/Application Support/Google/Chrome/NativeMessagingHosts"
+    TARGET_DIR_CHROMIUM="$HOME/Library/Application Support/Chromium/NativeMessagingHosts"
+    TARGET_DIR_FIREFOX="$HOME/Library/Application Support/Mozilla/NativeMessagingHosts"
+    TARGET_DIR_VIVALDI="$HOME/Library/Application Support/Vivaldi/NativeMessagingHosts"
+  fi
+else
+  if [ "$(whoami)" == "root" ]; then
+    TARGET_DIR_CHROME="/etc/opt/chrome/native-messaging-hosts"
+    TARGET_DIR_CHROMIUM="/etc/chromium/native-messaging-hosts"
+    TARGET_DIR_FIREFOX="/usr/lib/mozilla/native-messaging-hosts"
+    TARGET_DIR_VIVALDI="/etc/vivaldi/native-messaging-hosts"
+  else
+    TARGET_DIR_CHROME="$HOME/.config/google-chrome/NativeMessagingHosts"
+    TARGET_DIR_CHROMIUM="$HOME/.config/chromium/NativeMessagingHosts"
+    TARGET_DIR_FIREFOX="$HOME/.mozilla/native-messaging-hosts"
+    TARGET_DIR_VIVALDI="$HOME/.config/vivaldi/NativeMessagingHosts"
+  fi
+fi
+
+function usage {
+  echo "Usage: $0 [OPTION] [chrome|chromium|firefox|opera|vivaldi]
+
+  Options:
+    -l, --local    Install files from disk instead of downloading them
+    -h, --help     Show this message"
+}
+
+while [[ $# -gt 0 ]]; do
+  case $1 in
+    chrome)
+      BROWSER_NAME="Chrome"
+      TARGET_DIR="$TARGET_DIR_CHROME"
+      ;;
+    chromium)
+      BROWSER_NAME="Chromium"
+      TARGET_DIR="$TARGET_DIR_CHROMIUM"
+      ;;
+    firefox)
+      BROWSER_NAME="Firefox"
+      TARGET_DIR="$TARGET_DIR_FIREFOX"
+      ;;
+    opera)
+      BROWSER_NAME="Opera"
+      TARGET_DIR="$TARGET_DIR_VIVALDI"
+      ;;
+    vivaldi)
+      BROWSER_NAME="Vivaldi"
+      TARGET_DIR="$TARGET_DIR_VIVALDI"
+      ;;
+    -l|--local)
+      USE_LOCAL_FILES=true
+      ;;
+    -h|--help)
+      usage
+      exit 0
+      ;;
+    *)
+      usage
+      exit 1
+      ;;
+  esac
+  shift
+done
+
+PYTHON3_PATH="$(which python3)"
+if [ -x "$PYTHON3_PATH" ]; then
+  echo "Python 3 executable located at $PYTHON3_PATH"
+else
+  echo "Python 3 executable not found, but Python 3 is required for PassFF to work!"
+  exit 1
+fi
+
+if [ -z "$TARGET_DIR" ]; then
+  usage
+  exit 1
+fi
+
+HOST_FILE_PATH="$TARGET_DIR/$APP_NAME.py"
+MANIFEST_FILE_PATH="$TARGET_DIR/$APP_NAME.json"
+ESCAPED_HOST_FILE_PATH="${HOST_FILE_PATH////\\/}"
+
+echo "Installing $BROWSER_NAME host config"
+
+# Create config dir if not existing
+mkdir -p "$TARGET_DIR"
+
+if [ "$USE_LOCAL_FILES" = true ]; then
+  DIR="$( cd "$( dirname "$0" )" && pwd )"
+  cp "$DIR/passff.py"   "$HOST_FILE_PATH"
+  cp "$DIR/passff.json" "$MANIFEST_FILE_PATH"
+else
+  # Download native host script and manifest
+  curl -sSL "$HOST_URL"     > "$HOST_FILE_PATH"
+  curl -sSL "$MANIFEST_URL" > "$MANIFEST_FILE_PATH"
+fi
+
+# Replace path to host
+sed -i -e "s/PLACEHOLDER/$ESCAPED_HOST_FILE_PATH/" "$MANIFEST_FILE_PATH"
+
+# Replace path to python3 executable
+sed -i "1c#\!${PYTHON3_PATH}" "$HOST_FILE_PATH"
+
+# Set permissions for the manifest so that all users can read it.
+chmod a+x "$HOST_FILE_PATH"
+chmod o+r "$MANIFEST_FILE_PATH"
+
+echo "Native messaging host for $BROWSER_NAME has been installed to $TARGET_DIR."
diff --git a/src/passff.json b/src/passff.json
new file mode 100644
index 0000000..e954a43
--- /dev/null
+++ b/src/passff.json
@@ -0,0 +1,7 @@
+{
+  "name": "passff",
+  "description": "Host for communicating with zx2c4 pass",
+  "path": "PLACEHOLDER",
+  "type": "stdio",
+  "allowed_extensions": [ "passff@invicem.pro" ]
+}
diff --git a/src/passff.py b/src/passff.py
new file mode 100755
index 0000000..17ea50b
--- /dev/null
+++ b/src/passff.py
@@ -0,0 +1,101 @@
+#!/usr/bin/env python3
+
+"""
+    Host application of the browser extension PassFF
+    that wraps around the zx2c4 pass script.
+"""
+
+import os, sys, json, struct, subprocess
+
+VERSION = "_VERSIONHOLDER_"
+
+################################################################################
+######################## Begin preferences section #############################
+################################################################################
+# Default command for MacOS:
+#command = "/usr/local/bin/pass"
+command     = "/usr/bin/pass"
+commandArgs = []
+commandEnv  = {
+    "TREE_CHARSET": "ISO-8859-1",
+    # Default PATH for MacOS:
+    #"PATH": "/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin",
+}
+charset     = "UTF-8"
+################################################################################
+######################### End preferences section ##############################
+################################################################################
+
+def getMessage():
+    """ Read a message from stdin and decode it. """
+    rawLength = sys.stdin.buffer.read(4)
+    if len(rawLength) == 0:
+        sys.exit(0)
+    messageLength = struct.unpack('@I', rawLength)[0]
+    message = sys.stdin.buffer.read(messageLength).decode("utf-8")
+    return json.loads(message)
+
+def encodeMessage(messageContent):
+    """ Encode a message for transmission, given its content. """
+    encodedContent = json.dumps(messageContent)
+    encodedLength = struct.pack('@I', len(encodedContent))
+    return {'length': encodedLength, 'content': encodedContent}
+
+def sendMessage(encodedMessage):
+    """ Send an encoded message to stdout. """
+    sys.stdout.buffer.write(encodedMessage['length'])
+    sys.stdout.write(encodedMessage['content'])
+    sys.stdout.flush()
+
+if __name__ == "__main__":
+    # Read message from standard input
+    receivedMessage = getMessage()
+    args = []
+    stdin = None
+
+    if len(receivedMessage) == 0:
+        pass
+    elif receivedMessage[0] == "insert":
+        args = ["insert", "-m", receivedMessage[1]]
+        stdin = receivedMessage[2]
+    elif receivedMessage[0] == "generate":
+        args = ["generate", receivedMessage[1], receivedMessage[2]]
+        if "-n" in receivedMessage:
+            args.append("-n")
+    else:
+        key = receivedMessage[0]
+        key = "/" + key if key[0] != "/" else key
+        args.append(key)
+
+    # Set up (modified) command environment
+    env = dict(os.environ)
+    if "HOME" not in env:
+        env["HOME"] = os.path.expanduser('~')
+    for key, val in commandEnv.items():
+        env[key] = val
+
+    # Set up subprocess params
+    cmd = [command] + args + commandArgs
+    proc_params = {
+        'stdout': subprocess.PIPE,
+        'stderr': subprocess.PIPE,
+        'env': env
+    }
+    if 'stdin' is not None:
+      proc_params['stdin'] = subprocess.PIPE
+
+    # Run and communicate with pass script
+    proc = subprocess.Popen(cmd, **proc_params)
+    if stdin is not None:
+      proc_in = bytes(stdin, charset)
+      proc_out, proc_err = proc.communicate(input=proc_in)
+    else:
+      proc_out, proc_err = proc.communicate()
+
+    # Send response
+    sendMessage(encodeMessage({
+        "exitCode": proc.returncode,
+        "stdout": proc_out.decode(charset),
+        "stderr": proc_err.decode(charset),
+        "version": VERSION
+    }))