In this article I have collected the most common Firefox extensions I use.

Here are some of the firefox Extensions I use:

• Ad Block Plus - This add-on allows you to right-click on a banner ad and block the banner so it won't be downloaded again.
  
• IE Tab - If you running windows and visit site that only work in IE you can use IE Tab.
• Tab mix plus - enhance Firefox's tab browsing capabilities.
• StumbleUpon - Lets you "channelsurf" the world wide web.
• Google Notebook - Great way to note things wherever you are.
  

The following extensions are essential for web development!

• Web Developer Toobar - Are you a web developer? not until you have the web developer toolbar.
  
• ColorZilla - Don't know what the hash for that colour was? this add-on will tell you.
• LinkChecker - Check the validity of all the links on your page quickly
• MeasureIT - Measure how many pixels something is on a page
  

Here are some other firefox related extentions I've found on the web:

• Best Firefox Extentions for Power users
  

And don't forget about Portable Firefox .

Further resources:

StumbleUpon:

• How to get StumbledUpon