Unfortunately there's still video tearing, even on my old Intel Sandybridge card. I noticed it full screen and it happens on Debian as well.
Can't use the intel driver with the Tearfree option because that apparently clashes with Firefox, which won't start up properly.
Had to resort to the Marco + Compton solution to fix.
EDIT: Marco Adaptive + Intel Tearfree with forced hardware acceleration disabled in Firefox (about:config) works ok.