I just finished the Ultimate Firefox Extension List for Junkies. It is an exhausting list of every extension that I use with Firefox including themes and search engines. Every item on the list is currently installed in every Firefox installation that I have. Many of those items I install before even using the browser. You can find a link on my blog to the page in the right hand sidebar.
This list of extensions is why I love Firefox so much. I love the fact that I can extend the capability of the browser far beyond what the original developers had in mind. For example, one extension that should be built into Firefox by default should be FireFTP. I just can't imagine using a browser that does not have a builtin FTP program. It just makes sense, does it not?
The list is ever-changing as I come across extensions, themes and search engines that I find useful. So check back for any updates.
Many people that I have shown this list to won't install extensions unless they come directly from the Mozilla site. That is fine, and understandable, however, I have had no issue with installing extensions from other sites. In fact, when the extension comes from another site rather than Mozilla, it seems to be much more professional and extensive, as is the case with the Google extensions. They also seem to be less buggy. I guess it is all up to you.
Every extension theme and search engine has been tested on the three major platforms. Mainly Windows XP, Mac OS X and Ubuntu Linux 5.10. Also, they have all been tested, and work with Firefox 1.5. Because 1.5 is the latest version of the Firefox browser. I have not tested these extensions fully on previous versions, although I used many of these extensions on previous versions. In other words, I don't care if they don't work on Firefox 1.0.* or earlier. Get the latest version.
With that said, many of these extensions do not play well with other extensions, and may crash your browser and/or delete your Firefox profile. The list of extensions your see pictured on the right all play well with each other, as I have had no problems to date. However, use at your own risk.
If you like the list, please link to the page rather than copying the list directly. I have spent a great deal of time on putting that list together, and would appreciate receiving the credit for it (compiling the list, not the extensions themselves). If you find any of those extensions useful, or if you use other extensions that you find incredibly useful, please drop me a line either in the comments or via email.
There are a few things left to add to the list to make it stand out even more. For example, I plan on changing the list bullet from the default black button to a star for the ones I think should be incorporated by default into the browser. An updated screenshot or two of each extension would prove useful too. Maybe a list of bugs and incompatibility issues with other extensions or browser versions would also be appropriate. At any rate, there is still a bit I would like to do to the list as time moves on.
Enjoy my list.