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Have tried all suggestions, still not working correctly Since I upgraded

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Since upgrading to quantum, I have had alot of time where sites are slowing down, hanging up, or stopping completely. I have always used firefox as my default browser, and had no problems until now.

Since upgrading to quantum, I have had alot of time where sites are slowing down, hanging up, or stopping completely. I have always used firefox as my default browser, and had no problems until now.

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Please consider this : uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files and C:\Program Files(x86) Then restart system. Then run Windows Disk Cleanup. (Note: This should be Pinned and run Weekly, If never done below expect 10's of gig's) Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do :

Reinstall with Current Release Firefox 58.0.2 with a Full Version Installer

Please let us know if this solved your issue or if need further assistance.