My custom config files for Firefox:

• userContent.css
• user.js

NOTE: Put user.js file in
C:\Documents and Settings\USERNAME\Application Data\Mozilla\Firefox\Profiles\PROFILENAME
and userContent.css file in
C:\Documents and Settings\USERNAME\Application Data\Mozilla\Firefox\Profiles\PROFILENAME\chrome
whereUSERNAME is your Windows login account name and PROFILENAME is the name of default firefox profile, an arbitrary name generated by firefox by default.

Recommended Extensions (add-ons):

(All extensions can be downloaded from http://ftp.mozilla.org/pub/mozilla.org/extensions/ OR go to https://addons.update.mozilla.org/ and search all extensions available)