Fedora 17 - Sluggish Firefox¶
The upgrade to Fedora 17 on my main system had gone well with no significant issues aside from one. When trying to start Firefox with multiple tabs loading it would hang locking the browser up. After trying the DNS problem route to upgrade problems etc. I finally traced the problem. The Flash plugin was out of date and the older version was being caught by the system as the log files outline. Upgrading the Flash plugin solved the problem and everything is back to normal.
Visit Plugin Check to check if your plugins need to be updated.