Firefox is a great web browser especially if you are a web developer. Through the Firefox extensions you can make your life a hell of a lot easier for a variety of web design/development tasks. I don’t normally have a ton of the extensions installed but below are my favourites and some I use everyday to make my life a little easier.

My favourite Firefox extensions

1. FireBug
   Firebug is a must have extension, making debugging of web pages a lot lot easier. This is by far the best out there, Safari has its web inspector and ie has a few variations but none of them come close to the functionality of firebug.
2. Web Developer Tool Bar
   The web developer toolbar is in the same vein as Firebug but, in my opinion, not as fully featured and as functional as Firebug. It does have some really good features though, such as disabling and viewing CSS and Javascript as well as easily checking for validity and accessibility.
3. Screengrab
   Screengrab is an extension that allows you to take a screen shot of the webpage you are viewing and the best bit is that it takes a full page screen shot which you can copy to the clipboard or save to disk.
4. Measureit
   Measureit enables you to measure any element on the page which is handy if you want to find out dimensions, Firebug does this also but this is for a use.
5. Colorzilla
   This is a great little extension for getting the colours from a website, simply click and an eyedropper tool pops up enabling you to find out the colour of any element on the page, very handy.

These are just but a few extension that help to make life a little easier, but these are the ones I use every day.  IE8 is not far off the finishing line and I have played with the beta but the developer tools are still not a mark on Firebug so hopefully when the final is released better debugging tools will be a standard.