hi, we are currently aware of this issue on some windows 8 configurations with amd graphics cards and older drivers. please see if there's a more recent graphics driver available for your system at https://support.amd.com/en-us/download and if installing that already solves the playback issue.

otherwise you can do the following to work around the problem: enter about:config into the firefox address bar (confirm the info message in case it shows up) & search for the preference named media.windows-media-foundation.use-nv12-format. double-click it and change its value to false.

Hi I tried both way that you suggested. But it didn't work on my computer. It is not my computer problems because chrome and other video are fine. Only facebook and youtubu has purple and green screen after the Firefox automatic update. Can you please give me another solutions?

Regards

can you please double/triple check, that you have toggled the right about:config entry - also restart firefox once afterwards. numerous other users with the same symptoms have confirmed, that this is fixing the problem: https://support.mozilla.org/questions/firefox?tagged=bug1417442&show=done

only as a last resort you could disable hardware acceleration in firefox: Firefox's performance settings

At about: config, I did double click and change to default but that was false. And When I downloaded, one couldn't download which was radeon-crimon relive-17.11.2-minimalsetup-171116-web.exe.

Obviously not my computer problems. Can you change the false to true?