Bad screen tearing on Firefox 40 for Linux Mint wasn't there in Firefox 39.
I was jazzed about Firefox 40 because of the supposed Linux enhancements. But now, I have bad screen tearing and links that "jump" around when I hover over them.
I have an Nvidia GeForce 7600 GS. I've tried disabling smooth scrolling and hardware acceleration. No change. No trouble in Chromium now or Firefox 39.
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Try the version from the official Mozilla server if you currently use a version from the repositories of your Linux distribution.
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
- Do NOT click the Reset button on the Safe Mode start window
- https://support.mozilla.org/kb/Safe+Mode
- https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
Create a new profile as a test to check if your current profile is causing the problem.
See "Creating a profile":
- https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
- http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.