the-edmeister's
Firefox Informational pages

userChrome.css

userChrome.css is an optional file (created by the user or automatically created thru the installation of the ChromEdit extension) which controls CSS for the User Interface chrome of the Firefox application.
With a variety of style rules a user can alter the appearance of tabs, menus, Nav bars, the statusbar, and other visual appearances. A user can also specify rules to de-select the appearances of same said items if they so chose.

userContent.css

userContent.css is an optional file (created by the user or automatically created thru the installation of the ChromEdit extension) which controls CSS for content inside windows (i.e.; page display).
With style sheet rules the user can change various items for page display such as cursors, links, and items a user permits to be displayed from the website being viewed.

user.js

user.js is an optional file (created by the user or automatically created thru the installation of the ChromEdit extension) that uses preferences written in javascript to override preferences initialized by other preference files.
A user can script a line to modify virtually any preference in about:config and almost all preferences that lie deep within the various files that make up the Firefox browser.

It seems that only your imagination is the limit to the mods that can be done thru user.js. This file can be copied over to newer installations of Firefox or used with any other installation of Firefox.

I very highly recommend using the ChromEdit Extension
to modify the ’big three’ user preference files.
( userChrome.css, userContent.css, and user.js )
ChromEdit allows you to edit these files from within the Firefox browser;
of course you do need to exit and restart Firefox to see your changes.
( Get ChromEdit at mozdev.org or at at this extensions mirror.)

prefs.js

prefs.js is automatically generated by the application and reflects user changes made in about:config and is virtually unique to the individual installation of the Firefox browser. The installation of extensions adds preference names to about:config which subsequently appear in prefs.js. Changes made to an extensions parameters thru the Options dialog boxes will be reflected in about:config and thus will appear in prefs.js.
It is recommended that users not make modifications to the prefs.js file,
but rather confine their modifications to the user.js file.

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updated 12-29-2004