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Since downloading version 5, system has almost ground to a halt and "times out" all the time

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Since downloading the upgrade, my system has slowed to almost stop, accessing Googlemail takes forever and freqently gets "timed out" as do most attempts to access the internet and web pages.

This has rendered the system all but useless. I have checked the cable connection, modem and router and all are working fine.

I am not technically competent with computers so at a loss to know what to do next.

Since downloading the upgrade, my system has slowed to almost stop, accessing Googlemail takes forever and freqently gets "timed out" as do most attempts to access the internet and web pages. This has rendered the system all but useless. I have checked the cable connection, modem and router and all are working fine. I am not technically competent with computers so at a loss to know what to do next.

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Probably an extension The last extensions I disabled were extensions that I did not use much so haven't looked to see which ones:

The following extensions were disabled 2011-06-26 so that Firefox 5 could run quicker. Their functions were not added to Firefox 5, just another case of losing more extensions and functionality due to updates. about:accessibility, about:me, Dom Inspector, FxIF, GoogleEnhancer, InspecterWidget, LinkChecker, Location Navigator. I'll have to check out Dom Inspector, specifically

I will check them out later first one I'll putting back will be GoogleEnhancer, which I only took out because all similar extensions have been a problem at one time or another some are now replaced by others (customize google, optimize google, mcafee site advisor, wot)

I am using 72 extensions now:

Be sure to check your extensions against