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Firefox takes 15 minutes to load and then websites won't load

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Ever since the update Firefox has been taking at least 10-15 minutes to load. The when it does finally load, I can't always get a webpage to load...at least not for another 10 minutes.

I restarted the computer, cleared the cache and cookies, disabled all extensions...nothing helped. This happened the last time Firefox updated. At the time I just stopped System Mechanic from interfering and it worked easily again. This time it isn't System Mechanic, it doesn't seem to be the extensions....what now?

Ever since the update Firefox has been taking at least 10-15 minutes to load. The when it does finally load, I can't always get a webpage to load...at least not for another 10 minutes. I restarted the computer, cleared the cache and cookies, disabled all extensions...nothing helped. This happened the last time Firefox updated. At the time I just stopped System Mechanic from interfering and it worked easily again. This time it isn't System Mechanic, it doesn't seem to be the extensions....what now?

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Today, not only will it take that long to load, now I can't get to some of the web pages at all.