I have been using Firefox for as long as I can remember, but lately I had been facing a issue of Firefox taking around 5-10 seconds to exit when I closed it. I had been lazy to look up and resolve this issue, but today I finally got down to it.
After searching and reading lots of sites, wherein most of them pointed to some issue with the extensions. So one option was to disable all the extensions and enable them one by one and test to see which one was causing the problem. But this would take a lot of time. And most of the sites had users who mentioned the extensions they were using and they had tested them, so all the extensions I use were listed there. So I was pretty much sure extensions were not an issue.
Then on one site it was mentioned that this could be caused by a plugin like Flash. This is when I noticed that I had only a couple of plugins and I could test them in one go. So I disabled the Picasa plugin which I do not use much and restarted Firefox. Then closed it. Poof! It was gone immediately.
To confirm I open Firefox again, loaded a few pages closed some of them and exited Firefox again. Again, Poof! Immediately closed. So the slow exit was caused by the Picasa plugin which I was using. So much for the issues, one small plugin can cause so much slowdown in shutdown of an application. Looking forward to the next release of Firefox viz., 3.6. Hear it is a lot faster. Happy Browsing till then.