UbuntuHelp:FirefoxMandatoryPreferences

文章出处:

https://help.ubuntu.com/community/FirefoxMandatoryPreferences

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Firefox Mandatory Preferences

1. Important links

• http://kb.mozillazine.org/Locking_preferences
• http://kb.mozillazine.org/About:config_entries
• http://kb.mozillazine.org/Installation_directory
• http://www.alain.knaff.lu/%7Eaknaff/howto/MozillaCustomization/cgi/byteshf.cgi
• obscure-tool is in the firefox-dev package "sudo apt-get install firefox-dev"

Overall Process

1. We want to create mandatory preferences for Firefox
2. As an example we are setting
   1. The Firefox homepage to: `https://help.ubuntu.com/community/FirefoxMandatoryPreferences`
   2. The proxy settings to: `Auto-detect proxy settings for this network`
3. More settings can be found About:config description of the Mozilla

Knowledgebase

Determine settings

• open Firefox
• go to "about:config"
• search for "general.config"
• You will be presented with the default values (these could be changed in `/usr/lib/firefox/greprefs/all.js`)

general.config.obscure_value	13
general.config.filename	firefox.cfg

• We now know that the file to create is `firefox.cfg`. The location for this is the Firefox Application folder.
• Create a file `firefox.txt`. It's content will be:

//
lockPref("network.proxy.type", 4);
lockPref("browser.startup.homepage", "https://help.ubuntu.com/community/FirefoxMandatoryPreferences");

NOTE: The two slashes at the first line of the file are important otherwise Firefox won't understand your config file and refuse to start up

• OPTIONAL: Ubuntu ships with a default `firefox.cfg` file `/usr/lib/firefox/firefox.cfg` make a backup of that file
• `sudo cp /usr/lib/firefox/firefox.cfg /usr/lib/firefox/firefox.cfg.dist`
• sudo /usr/lib/firefox/obscure-tool firefox.txt /usr/lib/firefox/firefox.cfg
• Restart Firefox
• Go to `Edit` -> `Preferences` -> `Advanced` -> `Network` -> `Settings`
• All values should be greyed out and the selected Value should be `Auto-detect proxy settings for this network`
• Go to `Edit` -> `Preferences` -> `Main`
• The value of the homepage should show `https://help.ubuntu.com/community/FirefoxMandatoryPreferences` - changing that value shouldn't be possible as the field is greyed out.
• NOTE: The button above is not disabled in this config. A user may very well show a blank page on startup instead of the homepage. But hitting the `Home` button will take her to the homepage we set.