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I have Firefox 57 on a pc and 2 laptops (acer and asus) it locks up all 3 and stops responding. The faster firefox has brought all 3 to there knees. Is there a

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Some times runs at about same speed as previous versions then extremely slows down PCs some times does not respond and need to close with task manager. It doesn't matter if 1 or more tabs are open or just the home page. Am ready to down grade to last version.

Some times runs at about same speed as previous versions then extremely slows down PCs some times does not respond and need to close with task manager. It doesn't matter if 1 or more tabs are open or just the home page. Am ready to down grade to last version.

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Can you try disabling Accessibility Services and updating your graphics driver? Also, scan for malware.