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After installing Firefox 4 on my laptop, with windows XP, I'm having problems

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I sometimes have trouble opening Mozilla Firefox. A box opens and says"unresponsive script" and asks do I want to continue or stop script. I never saw this before downloading F4. I also get "firefox not responding" on the blue bar at the top, when I try to navigate on Google. Installing this update has completely messed up my laptop. I have Windows XP. Please help.

I sometimes have trouble opening Mozilla Firefox. A box opens and says"unresponsive script" and asks do I want to continue or stop script. I never saw this before downloading F4. I also get "firefox not responding" on the blue bar at the top, when I try to navigate on Google. Installing this update has completely messed up my laptop. I have Windows XP. Please help.

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If the Blue Bar refers to Google Plus (Google+), see

As annoying as that is, your main problem for now is the "Unresponsive script", see