See attached screenshot. To reproduce, download Firefox Nightly from mozilla, open it, change gfx.content.azure.backends to skia. I can reproduce this both with the Mozilla binaries (GTK2) and the GTK3 test repository. As you can see the browser's chrome is rendered wrong, tab animations leave a trail, scrolling in about:config turns the text into an unreadable mess, buttons are not rendered correctly (even in webpage content), and some parts which should be white are grayish black. Tested on a new, clean profile without any extension or plugin. Running on Fedora Rawhide, with Mesa 10.2 on RadeonSI hardware. Related bugs: bug #740200 and bug #687187 On the positive side, if you can ignore the bad rendering, performance seems to be much better with skia, especially when it comes to <canvas> objects.

fwiw I can reproduce this on Intel hardware (with mesa 10.1) as well.

I can confirm this bug on Nvidia hardware (with proprietary driver 340.17). I'm using gtk2.

This seems to be fixed in recent nightly.