Firefox slow, especially gmail? – remove skype extension.

Ever since I updated the home computer to run the RTM version of Windows7 my gmail and greader experience has been very frustrating in Firefox. GReader just had no idea what data to display in the right hand side of the screen and gmail would just stick in the “please wait”, “loading” or “still working” status after sending an email (but would actually send the email).

Rebooting firefox into safe mode, or running ie8 worked fine so I knew it was not the computer but had to be an extension. Fortunately this was 100% reproducible so I was able to do some diagnostic tests.

I disabled all the likely culprits – flashblock, adblock,greasemonkey, better gmail, web developer, noscript but I still had the same problem. It wasn’t until I disabled the skype extension that the performance of google reader was back to normal and I could now send mail again.  Seeing as though I only really use Skype to call my parents I don’t need the extension so it is now disabled. For some reason the uninstall button is disabled.

I did find a thread on the Google Help forums with the same solution which was nice to know that I wasn’t the only one with the problem and I came up with the same solution.