about:config search for jit make sure is set to true also search for javascript and see if anything isn't default.
If that works, check to make sure you are using tracemonkey in your local copy (though your examples shouldn't require the JIT). Okay, if that wasn't it, how about it being a local Firefox issue? Go grab a copy of PortableFirefox and see if it's slow in there. (this should be a similar test to safemode, but sometimes profiles get all wonky and you just need a new one) ( Win+R>firefox.exe -ProfileManager) If it's not, start removing add-ons and restarting until you find the culprit/culprits. Create a new Firefox profile and see if things are still slow without any additional add-ons. First, let's make sure it's not just a profile issue.
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