De Personalizando o Firefox - Arquivos de Preferência Padrão :
The default preferences are stored in various files like all.js or
firefox.js. It is not recommended that you modify these files directly
(and you can't easily, because they are stored in the file
omni.jar). You can, however, create your own Javascript files and
place them in a location so that Firefox reads them as default
preferences. That location is the defaults/pref
directory in
the same location where the Firefox executable is placed. Files in
this location will be used for all Firefox users (they are not profile
specific).
Adding default preferences is as simple as creating a file with the
extension of .js in the defaults/preferences directory and adding
lines like:
pref("browser.rights.3.shown", true);
It's important that you get the format right based on the preference
type. In this case, the preference is a boolean, so we specify true or
false without quotes as the value on the right. If it is a string, you
put it in quotes. If it is an integer, you put the value without
quotes. You can tell the type of the preference by looking at the Type
column in about:config.
All you can do with the default preferences file is set the default
value of preferences. You cannot lock them and you cannot override
user set preferences.
Se este procedimento for muito pesado, devido ao problema de encontrar os nomes corretos
Para as preferências, pode-se usar o Assistente CCK do complemento
que fornece uma interface de assistente mais fácil:
The CCK Wizard can be used to create an extension that customizes
Firefox. To access it, after installation, select Tools->CCK Wizard.
I created this add-on so that people could deploy Firefox exactly the
way they wanted, especially enterprise users and educational
institutions.
Mozilla does not do enough to support corporate users, and this was my
attempt to remedy that.
It allows the following customizations:
- Add identifier to the user agent string
- Change the default home page and startup override home page
- Change the title bar text
- Change the animated logo
- Change the web page and tooltip used for the animated logo
- Add a help menu item that links to a web page
- Provide sites for which popups and XPInstalls are allowed by default
- Preinstall browser plug-ins
- Preinstall search engines
- Add a folder, bookmarks and live bookmarks to the personal toolbar
- Add a folder, bookmarks and live bookmarks to the bookmarks folder
- Set default preferences
- Lock preferences
- Add registry keys (Windows only)
- Add certificates
- Set default proxy configurations
- Package other XPIs with your distribution
- Disable about:config
EDIT: CCK tornou-se CCK2 e mudou para aqui .