After upgrading to 6.0.2 from 6.0.1, Firefox has become laggier in terms of response time.
For example, new tabs open/close after about a half-second pause. I notice when I do this, the CPU activity spikes to about 25% and dies down. Sometimes typing text will pause as well. Its behavior is as if it was bogged down with a memory leak.
Chosen solution
If anyone is still having problems, I seem to be having much better results after uninstalling the Facebook Toolbar.
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Update All your Firefox Plugins
=> When Downloading Plugins Update setup files, Remove Checkmark from Downloading other Optional Softwares with your Plugins (e.g. Toolbars, McAfee, Google Chrome, etc.)
Troubleshooting extensions and themes
Check and tell if its working.
I don't know if this was the cause, but the browser feels normal after upgrading Adobe Flash Player to the latest version. Thanks!
Chosen Solution
If anyone is still having problems, I seem to be having much better results after uninstalling the Facebook Toolbar.