Firefox and Thunderbird freezing/running slow on Kubuntu 13.04? Here's a possible fix

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http://www.kubuntuforums.net – If you're like me, you use Firefox and Thunderbird *a lot*. There is a bug in the gtk2-engines-oxygen package which causes these two Mozilla-distributed applications to freeze unexpectedly or run unacceptably slowly in Kubuntu Raring. Some people have tried switching to other GTK themes to alleviate the problem. I tried using Raleigh and it helped with the freezing, but not the slowness. (Also, Raleigh is ugly compared to Oxygen). Thankfully, Petr Sedlacek (petr-sedlacek) has made available a .deb with an updated gtk2-engines-oxygen package for 64-bit systems that makes this problem go awa (HowTos)