Based on: https://stackoverflow.com/questions/40472961/webgl-unavailable-gpu-process-unable-to-boot
Note: The following is considered experimental. So I have no idea on the consequences of browser stability/security of enabling the following features/“fixes”.
In Google-Chrome, go to:
chrome://gpu. In section “Graphics Feature Status”, most of the options should start with:
Open a new tab and go to
Experiements, the first option should be
Override software rendering list.. Click
Enable. Relaunch Google Chrome.
chrome://gpu. There should be more features that say
Hardware accelerated. This should eliminate tearing on html5 and Netflix.
For Opera: do the same because Opera is based on Chromium. Open tab:
opera://flags (either one). In search box on top: type
override. The top result should be
Override software rendering list. Click
Enable. Relaunch Opera. The tearing should be gone.
(To watch Netflix on Opera: install a user-agent switch and make sure the agent string is for an up-to-date browser, or else it won’t work. This one works:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36)