These aren't in any particular order, but I wanted to share the main Firefox Add-ons that I use, and ask readers what they like/use.
Fast Dial- Visual bookmarks. This is my start page. It provides thumbnails of the sites that I visit most. You can vary the number it displays. I use 12, but the more you do, the smaller the thumbnail, and the less recognizable it is. I believe the default is 9 images. Great app.
Ghostery - Watches sites that are watching you. Ghostery alerts you when visit a site that has bugs on it (which can be hidden scripts that track your behavior)
Total Validator - Validates code from within the browser.
ColorZilla - Gives you hex colors via an eyedropper. Helps with matching colors easily.
You must be thinking "Whoa! 2 posts in one day, after a long drought!" Right? I know. I'm thinking the same thing. I'm back on this horse and plan to be a more-consistent poster. Whether I'll succeed, we'll see.