[Discover] FirePHP - Firebug Extension for AJAX Development http://www.firephp.org/HQ/Use.htm
(php firefox debugging software) 
[Discover] del.icio.us/help/firefox/search http://del.icio.us/help/firefox/search (firefox tagging)
[Discover] Mozilla Firefox Erweiterungen http://texturizer.net/firefox/extensions/ (firefox)
[Discover] Mouseless Browsing in Firefox http://www.mouseless.de/index.php?/content/view/14/26/ (firefox)
[Discover] Urban Puddle : Quick Tip: Open Thunderbird Links in Firefox http://www.urbanpuddle.com/articles/2007/11/30/quick-tip-open-thunderbird-links-in-firefox (thunderbird open firefox links)
[Discover] Gspace :: Firefox Add-ons https://addons.mozilla.org/en-US/firefox/addon/1593 (firefox google gmail storage)
[Discover] del.icio.us/help/firefox/search http://del.icio.us/help/firefox/search (firefox tagging)
[Discover] Mozilla Firefox Erweiterungen http://texturizer.net/firefox/extensions/ (firefox)
[Discover] Mouseless Browsing in Firefox http://www.mouseless.de/index.php?/content/view/14/26/ (firefox)
[Discover] Urban Puddle : Quick Tip: Open Thunderbird Links in Firefox http://www.urbanpuddle.com/articles/2007/11/30/quick-tip-open-thunderbird-links-in-firefox (thunderbird open firefox links)
[Discover] Gspace :: Firefox Add-ons https://addons.mozilla.org/en-US/firefox/addon/1593 (firefox google gmail storage)