So, without further ado, here are my favorite Firefox add-ons:
- PDF Download
This one allows more flexibility about what FF does with PDFs. Instead of just opening it in-browser, it allow you to download it, open it in a new window, or view it as HTML. - IE View Lite
Firefox is great, but not all sites were programmed with the idea that anyone will access them without IE. On Windows systems, this allows you to quickly view the current page in IE. - Resizeable Textarea
This gives you the Safari-like functionality of being able to resize large text fields. - Server Spy
Lets you know in a little section at the bottom of the FF window what kind of server a site is using. It's interesting information. Always fun to see the broken sites running IIS and say, "Oh, well there's your problem!" - Web Developer
By far my favorite FF add-on. This gives you a little toolbar with more web development tools than you would ever need. It gives css and javascript tools, shows you divs, classes and ids, style information for a given element, and lots more.