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firefox is using 98 to 100% of cpu all the time

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My computer runs slow and sometimes has to be rebooted to continue. When I hit ctrl alt delete it says that Firefox is using 98 % of my cpu. I reloaded Firefox and it worked for a short time but the problem returned.

This happened

Every time Firefox opened

== Shortly after I installed Firefox my computer slowed to a crawl

My computer runs slow and sometimes has to be rebooted to continue. When I hit ctrl alt delete it says that Firefox is using 98 % of my cpu. I reloaded Firefox and it worked for a short time but the problem returned. == This happened == Every time Firefox opened == Shortly after I installed Firefox my computer slowed to a crawl

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Please include extension info from Help -> Troubleshooting information in Firefox's menu