Config
Note: Ubuntu installs xul-ext-ubufox to tweek firefox. Today, it acts as a placeholder for future updates (see package content).
about:certificate
Basic infos
Manual Config
- key descriptions → the MUST read file!
- using about:config
- using developer toolbar
Misc
- Firefox "obfuscation" : by default, Firefox expects obfuscated files to be byte shifted by 13 bytes (ROT13). Here is a basic encoder/decoder.
- Troubleshooting preferences
User defined preferences
All the following configuration is stored inside the user home folder (the profile folder, to be precise).
Documentation
- A brief guide to Mozilla preferences
- Resetting preferences
- OLD but interesting example
- Example (do NOT use as it is)
The following files are located inside the profile folder
- prefs.js stores the preferences. It MUST NOT be edited!
- user.js stores a configuration which is written back to prefs.js file each time you restart your application.
→ See homemade user.js file
Simple system level config
Inside /etc/firefox/syspref.js → WARNING: This path may be installation dependant
Changes the default value : the user can update it
pref("browser.startup.homepage", "https://ubuntu.com/");
Forces the value (user can't change it!)
pref("browser.startup.homepage", "https://ubuntu.com", locked);
NOTE : lockPref("browser.startup.homepage", "https://ubuntu.com"); does NOT work on recent releases!
Advanced system level config
PRO tip : it is possible to reference a REMOTE file. See autoadmin.global_config_url
Sources
$ cat /usr/lib/firefox/defaults/pref/autoconfig.js
// The first line MUST be a comment
// a "good" name for this file can be local-settings.js or autoconfig.js
pref("general.config.filename", "firefox.cfg");
pref("general.config.obscure_value", 0);
$ cat /usr/lib/firefox/firefox.cfg // the first line MUST be a comment ...
- pref(prefName, value) – sets the user value of a preference. This function explicitly sets the preference as a user preference. That means that if the user has changed the value, it will get reset every time the browser is started.
- defaultPref(prefName, value) – sets the default value of a preference. This is the value that a preference has when the user has not set any value or the user resets the preference. It can be permanently changed by the user.
- lockPref(prefName, value) – sets the default value of a preference and locks it. This is the most commonly used function. Locking a preference prevents a user from changing it, and in most cases, disables the UI in preferences so it is obvious to the user that the preference has been disabled.
- clearPref(prefName) – removes the user value of a preference, resetting it to its default value.
In an enterprise environment : using policies.json
- about:policies
- List of policies
- Customizing Firefox Using policies.json
Attachments