Firefox is always been the favorite choice for the developers for debugging and developing web applications. The extension architecture allows anyone to add powerful add-on to the browser for robust enhancement on many different development needs. I use Firefox everyday like I need to take my lunch and dinner. So here are the most useful Firefox extensions I use that I want to share with everyone. I have to admit, many of these extensions won’t come as a eye opener to developers those who are already so deep with Firefox extensions, but hopefully there will be some you’ve yet to know about.