This documentation is no longer maintained.  Please see the maintained documentation of mozprofile at

Mozprofile is a python tool for creating and managing profiles for Mozilla's applications (Firefox, Thunderbird, etc.). In addition to creating profiles, mozprofile can install addons and set preferences.
Mozprofile can be utilized from the command line or as an API.

Command Line Usage

mozprofile may be used to create profiles, set preferences in profiles, or install addons into profiles.

The profile to be operated on may be specified with the --profile switch. If a profile is not specified, one will be created in a temporary directory which will be echoed to the terminal:

(mozmill)> mozprofile 
(mozmill)> ls /tmp/tmp4q1iEU.mozrunner

To run mozprofile from the command line enter: mozprofile --help for a list of options.

API Usage

To use mozprofile as an API you can import mozprofile.profile and/or the AddonManager.

mozprofile.profile features a generic Profile class. In addition, subclasses FirefoxProfile and ThundebirdProfile are available with preset preferences for those applications.

Installing Addons

Addons may be installed individually or from a manifest.


from mozprofile import FirefoxProfile

# create new profile to pass to mozmill/mozrunner
profile = FirefoxProfile(addons=["adblock.xpi"])

Setting Preferences

Preferences can be set in several ways:

  • using the API: You can pass preferences in to the Profile class's constructor: obj = FirefoxProfile(preferences=[("accessibility.typeaheadfind.flashBar", 0)])
  • using a JSON blob file: mozprofile --preferences myprefs.json
  • using a .ini file: mozprofile --preferences myprefs.ini
  • via the command line: mozprofile --pref key:value --pref key:value [...]

When setting preferences from an .ini file or the --pref switch, the value will be interpolated as an integer or a boolean (true/false) if possible.

Setting Permissions

mozprofile also takes care of adding permissions to the profile. See


Other Mozilla programs offer additional and overlapping functionality for profiles. There is also substantive documentation on profiles and their management.

Document Tags and Contributors

 Contributors to this page: teoli, wlach, jhammel
 Last updated by: wlach,