[hiccuphippo]

You can enable it manually with the following:

> To turn on WebRender, go to about:config, enable the gfx.webrender.all pref, and restart the browser.

[vbuwivbiu]

if you enable it & restart on another platform will it work ? how would you confirm it's working ?

[callahad]

It should. To confirm it's working, visit about:support and look for "WebRender" in the "Compositing" field.