Firefox 3.6 has a couple of minor improvements. The one user’s will most appreciate is instant previews of personas, which are skins for Firefox. Basically, it shows a picture over the unused portions of your browser window. Go to GetPersonas.com to check them out.

As I detail in that video, there are also many behind-the-scenes improvements. Performance is up about 15% compared to Firefox 3.5, and the new version has support for several new types of Web content, including full-screen video (without using Flash), gradient backgrounds in CSS, Web Open Fonts Format, drag-and-drop support, and the ability for Web pages to interact with your computers accelerometer (if you have one, like the new Macs do).

I also cover how to fix incompatible add-ons. Basically, grab the Add-on Compatibility Reporter add-on and restart Firefox. Easy.