Firefox is often "unresponsive";what is 'unresponsive script?why is firefox so SLOW in response to my site requests?

A friend installed Mozilla Firefox for me about 3 months ago to replace Kaspersky which always slowed my computer responses. Now Firefox is slow at responding to looking for my e-mail, at searching for info, and often the message"NOT RESPONDING" following Mozilla Firefox and nothing happens for several minutes. Also, "Unresponsive Script" comes up with the option to cancel or continue--what is "Script" and "WHY"? I have Windows 7 and anE-Machines modem. Also, I am told often that my Anti-Virus is out-of-date even tho' I have it set to update daily at 11:00 pm and I am sure to have the computer ON from 11 to 12 PM each night. How do I fix this? I am a computer 'dummie' and don't understand all the terms and phrases used, but I try. Please help.
Thanks,
Pierre Pawlak
[email protected]

Unfortunately Firefox 6 is not as good as it should be.
I recommend you to use latest version of Firefox 3.6.x ,cause it's long release but fire fox 4 , 5 and 6 are short releases and not as good as they should be.
'''''Hope for Firefox 7 !'''''

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Firefox is often "unresponsive";what is 'unresponsive script?why is firefox so SLOW in response to my site requests?

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