![]() ![]() ![]() This means that configurations in the policies.json file will take precedence over configurations in the mozilla.cfg file, and so on. If there are contradictory configurations in different configuration files, the priority of the configuration files is as follows: These files are typically located in the ~/.mozilla/firefox// directory or in the /etc/firefox/ directory, depending on whether they are intended to apply to a specific Firefox profile or system-wide. There are several other configuration files that can be used to configure Firefox, such as prefs.js, autoconfig.js, mozilla.cfg, and local-settings.js. You can also place the user.js file in the /etc/firefox/ directory to apply the configuration system-wide. You can place the user.js file in the ~/.mozilla/firefox// directory to apply the configuration to a specific Firefox profile. You can use the user.js file to set default values for advanced configuration options that are not exposed in the GUI or about:config page. The user.js file is a script that is used to configure Firefox when it starts up. ![]() For user-specific configuration, you can place the policies.json file in the ~/.mozilla/firefox// directory, where is the name of the Firefox profile. On Linux systems, you can use the policies.json file to configure Firefox system-wide or for a specific user by placing the file in the appropriate location.įor system-wide configuration, you can place the policies.json file in the /etc/firefox/ directory. The policies.json file is used to configure Firefox using Group Policy Objects (GPOs) on Windows systems. Note that some of these options may be experimental or unsupported, and changing them may have unintended consequences. This will open a page with a list of advanced configuration options that you can modify. You can access advanced configuration options in Firefox by typing "about:config" in the address bar and pressing Enter. You can access the configuration options by going to the menu (the three horizontal lines in the top-right corner of the window), selecting "Preferences" and then navigating to the settings you want to modify. The easiest way to configure Firefox is through the graphical user interface (GUI). If you see potential to improve the answer, feel free to edit and improve it.įirefox and Firefox ESR (Extended Support Release) can be configured on various configurations files and methods: ![]() If you don't use Firefox but the more configurable Firefox-esr, swap the two following entries in If you have installed Firefox or Firefox-esr and what the installation location is called, you can use the following query: whereis firefox The file locations are for a system-wide configuration: /etc/firefox/policies/policies.jsonįor one that is limited to the user, they are: /etc/firefox/profilename/prefs.js Policies.json, this file can be edit by hand They are also only of limited use, since they are not protected against changes by users, Mozilla or unfriendly software.Ī file based configuration is possible through the following files: user.js, you can edit by hand, changing will be added by next FF start on prefs.js The above configurations are only valid in the FF profile in which they were made and are overridden by user-wide and even more so by system-wide defaults. Do it only by the way above.Ī further and more extensive possibility than the before mentioned, exists over the browser line, over the call: The configuration will be saved on: prefs.jsĭont edit this file by hand. Or via the browser line via: about:preferences Via the GUI of Firefox which can be accessed either via: Firefox can be configured in both file and non-file based ways. ![]()
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