Firefox Tips
Plugins
Entering 'about:plugins' (without quotes) in the address bar shows a list of currently installed plugins.
MozEX
The MozEX plug-in allows you to configure a text editor for viewing page source and editing text areas.
Spell Checker
Install the appropriate language pack. E.g. in Debian 5.0 (Lenny) the British language pack is installed as follows:
# apt-get install iceweasel-l10n-en-gb
Iceweasel is the Debian version of Firefox.
Changing Language Settings
Changing the language settings is done by right clicking on a field and selecting the appropriate language.
See also http://kb.mozillazine.org/Dictionaries#Selecting_an_installed_dictionary
Developer Plug-ins
Install the following packages from Debian 5.0 (Lenny)
# aptitude install iceweasel-firebug iceweasel-webdeveloper
Alternatively visit the Web Developer and Firebug home pages.
Configuration Settings
Advanced configuration settings can be modified by entering a URL of about:config in the address bar.
http://kb.mozillazine.org/About:confighttps://wiki.mozilla.org/Firefox:Printing_and_Page_Setuphttp://www.watchingthenet.com/how-to-change-or-customize-firefox-printing-defaults.html
References
-- Frank Dean - 07 Sep 2009