Hey all, well the question is simple. what firefox plugins do you use?
The few I use are:
Adblock Plus (blocks annoying ads on websites, located on the navigation toolbar)
Capture Fox (capture your screen, record your voice, located on the status bar)
FoxyTunes (control your media player straight from firefox, located on the status bar)
Video DownloadHelper (download videos embeded online, located on the navigation toolbar)
WebDeveloper (toolbar with web developer tools)
Read it Later (Save pages to read later, bookmark later, located on Navigation toolbar)
StumbleUpon (toolbar designed to suggest sites with content from your interests)
I like placing the location in case you're interested in one of these, but are like me and like to have as few toolbars as possible and a clean UI, this way you'll know if your UI will remain clean.
I found another very useful FireFox plugin that I really like, and you will see by its description why it is so useful:
LongURL Mobile Expander
You should always know where a link takes you before clicking on it. Services like TinyURL.com make that difficult. LongURL Mobile Expander uses the LongURL.org web services to let you know where shortened links *really* go.