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Getting the same errors, this is with and without extensions, and I made sure Java was up to date.
This issue can be caused by an extension that isn't working properly.
Another user has reported that the Social Fixer extension caused this issue.
Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
I have the same problem but it happens on pages that are not on facebook, (like pages on Oprah.com) which tells me its NOT socialfixer, or not JUST to do with socialfixer.
My java is also up-to-date.
I still have the problem. Is there a way that Firefox can fix the problem from their end, for those of us who aren't that technically savvy?
I would like you to first try Safe Mode. Do not confuse this with Windows safe mode. Read here: https://support.mozilla.org/kb/Safe+Mode If you can operate your browser, you should be able to get into Safe Mode. Reading is knowledge, thus read the link first. Once you achieve Safe Mode, report back to us on the forum with your results. Good Luck!