As a web developer I need to be able to debug websites easily, and I really feel sorry for those poor souls that had to do development and bugfixing back in the days when there was no firefox. Check out these vital addons I use every day to make my life so much easier:

1. Firebug – A must have for anyone who needs to edit HTML or CSS. This tool will let you inspect all parts of your page and make temporary changes to your site so you can easily see how the changes will look.
2. Iimmgg.com Tools – Since I do a lot of screengrabs of websites every day, this tool is an absolute killer. It allows you to save the screenshot locally or upload it directly so that others can see (example ) . Vital do doing forum work for WooThemes when you need to show something.
3. TwitterFox – If you’re on Twitter, then this tool makes it dead easy to receive updates and add new ones.
4. FoxMarks – I have more than one PC, so I need my bookmarks stored on my laptop as well. With this plugin that is as easy as pie
5. FireGestures – I’m an addict of shortcuts, and when I want to browse quickly and go back, forward, open a new tab and close a tab, I use this plugin to do that all with my mouse. Saves a lot of time if you surf a lot.

Honorable mentions: Web developer Toolbar, Download Statusbar, ColorZilla, Screengrab, YSlow

Got any vital plugins you can’t live without that I have missed?