To do my job I relie on a whole series of tools.  Here are my personal favourites.

• Rank Checker by seobook.com for ranking spot checks
• Live HTTP header for seeing what’s going on in the background.
• Speeddial – allows you to set up to 9 pretty bookmarks (Chrome ripped it off), comes with Page Info which tells you the top level info all in one place.
• Stumbleupon toolbar for when you get bored with the net and see something new!
• CookieWatcher – show value of cookie in statusbar (i.e. SESSID)
• Download Statusbar – screen real estate efficient download status indicator 
• Firebug + Firecookie for working out how things are actually working and mocking up changes
• PDF Download – provides more control over what happens when you click on a link for a PDF
• User Agent Switcher – quick switch to different user agents
• Web Developer – oldy but goody
• FoxClocks – show time from various time zones
• Tiny Menu – customise menu bars. Mine is a single menu that opens to reveal all of the standard Firefox menus

Tags: Browsers, Mozilla, Tools