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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.


def __init__(self,
             profile=None, # Path to the profile
             addons=None,  # String of one or list of addons to install
             addon_manifests=None,  # Manifest for addons, see
             preferences=None, # Dictionary or class of preferences
             locations=None, # locations to proxy
             proxy=False, # setup a proxy
             restore=True # If true remove all installed addons preferences when cleaning up

def reset(self):
    """reset the profile to the beginning state"""

def set_preferences(self, preferences, filename='user.js'):
    """Adds preferences dict to profile preferences"""

def clean_preferences(self):
    """Removed preferences added by mozrunner."""

def cleanup(self):
    """Cleanup operations for the profile."""


def __init__(self, profile):
    """profile - the path to the profile for which we install addons"""

def install_addons(self, addons=None, manifests=None):
    Installs all types of addons
    addons - a list of addon paths to install
    manifest - a list of addon manifests to install

def get_amo_install_path(self, query):
    Return the addon xpi install path for the specified AMO query.
    for query documentation.

def addon_details(cls, addon_path):
    returns a dictionary of details about the addon
    - addon_path : path to the addon directory
    {'id':      u'', # id of the addon
     'version': u'1.4',                # version of the addon
     'name':    u'Rainbow',            # name of the addon
     'unpack': False } # whether to unpack the addon

def clean_addons(self):
    """Cleans up addons in the profile."""

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.