Firefox Decrypt

Build Status wercker status

The master branch is unstable during migration to Python 3.

If you must use Python 2, please try Firefox Decrypt 0.7.0.

If you encounter a problem, try the latest release or check open issues for ongoing work.


Firefox Decrypt is a tool to extract passwords from profiles of Mozilla (Fire/Water)fox™, Thunderbird®, SeaMonkey® and some derivates.

It can be used to recover passwords from a profile protected by a Master Password as long as the latter is known. If a profile is not protected by a Master Password, a password will still be requested but can be left blank.

This tool does not try to crack or brute-force the Master Password in any way. If the Master Password is not known it will simply fail to recover any data.

This script is written in Python and is compatible with versions 2.7+ (last is 0.7.0) and 3.6+. On Windows, only Python 3 is supported.

Additionally, it requires access to libnss3 which is included with Firefox and Thunderbird, although depending on system configuration, the script may fail to locate the library or may load an incorrect/incompatible version.

Alternatively, you can install libnss3 (Debian/Ubuntu) or nss (Arch/Gentoo/…). libnss3 is part of

If you need to decode passwords from Firefox 3 or older, this is not officially supported but a patch exists in this pull request.




The tool will present a numbered list of profiles. Enter the relevant number.

Then, a prompt to enter the master password for the profile:

Advanced usage

If your profiles are at an unusual path, you can call the script with:

python /folder/containing/profiles.ini/

If you don't want to display all passwords on the screen you can use:

python | grep -C2 keyword

where keyword is part of the expected output (URL, username, email, password …)

Since version 0.7.0 passwords may be exported in CSV format using the --format flag.

python --format csv

Additionally, --delimiter and --quotechar flags can specify which characters to use as delimiters and quote characters in the CSV output.

Since version 0.4 it is possible to export stored passwords to pass from To do so, use:

python --export-pass

and all existing passwords will be exported after the pattern web/<address>[:<port>] unless multiple credentials exist for the same website in which case /<login> is appended. The username will be on a second line.

To prefix the username with login: for compatibility with the browserpass extension, you can use:

python --export-pass --pass-compat browserpass

There is currently no way to selectively export passwords.

Exporting will overwrite existing passwords without warning. Ensure you have a backup or are using the pass git functionality.

Starting with version 0.5.2 it is now possible to use a non-interactive mode which bypasses all prompts, including profile choice and master password. Use it with -n/--no-interactive. Indicate your profile choice by passing -c/--choice N where N is the number of the profile you wish to decrypt (starting from 1).

You can list all available profiles with -l/--list (to stdout).

Your master password is read from stdin.

$ python --list
1 -> l1u1xh65.default
2 -> vuhdnx5b.YouTube
3 -> 1d8vcool.newdefault
4 -> ekof2ces.SEdu
5 -> 8a52xmtt.Fresh

$ read -sp "Master Password: " PASSWORD
Master Password:

$ echo $PASSWORD | python --no-interactive --choice 4
Username: 'john.doe'
Password: '1n53cur3'

Username: 'max.mustermann'
Password: 'Passwort1234'

Username: 'octocat'
Password: 'qJZo6FduRcHw'


$ echo $PASSWORD | python -nc 1
Username: 'foo'
Password: 'bar'

Username: 'whatdoesthefoxsay'
Password: 'w00fw00f'


$ # Unset Password


If a problem occurs, please try firefox_decrypt in high verbosity mode by calling it with:

python -vvv

If the output does not help you to identify the cause and a solution to the problem, file a bug report including the verbose output. Beware:


Both Python and Firefox must be either 32-bit or 64-bit.

If you mix architectures the code will fail. More information on issue #8.


If you get the error described in #14 when loading libnss3, consider installing nss using brew or an alternative package manager.


If you wish to run the test suite locally, chdir into tests/ and run ./run_all

If any test fails on your system, please ensure libnss is installed.

If tests continue to fail, re-run with ./run_all -v then please file a bug report including:

It is much appreciated.

Spin-off, derived and related works

Firefox is a trademark of the Mozilla Foundation in the U.S. and other countries.