layers.offmainthreadcomposition.force-disabled

Graphic glitchiness usually is caused by an incompatibility between Firefox and the driver software for your graphics card or chipset. Often this can be resolved by updating your driver software, but sometimes there are irreconcilable differences and you have to selective disable some Firefox features to resolve the issue. ''Updating drivers'' Please see this article for safe ways to check for updates. Please don't trust random sites in web searches. [[Upgrade your graphics drivers to use hardware acceleration and WebGL]] ''Disabling OMTC'' You shared the data that you have an Nvidia adapter. One thing some Nvidia users had to do in older versions of Firefox was disable "off main thread composition" as follows: (0) Select and copy the following new preference name: layers.offmainthreadcomposition.force-disabled (1) In a new tab, type '''about:config''' in the address bar and press Enter. Click the button promising to be careful. (2) In the search box above the list, type or paste '''layers.off''' and pause while the list is filtered (3) Right-click a blank area of the page, click New, then Boolean (4) Paste the preference name, then click OK (5) Select true, then click OK -- the preference should appear in the list, bolded, and user set to true -- if you need to remove this later, right-click > Reset it I think you probably need to restart Firefox before that takes effect.