> enabling or disabling WebRender didn't make a difference (AMD 7650k APU + Mesa-19.0 drivers) This is a duplicate of non-WR bug 1529614. For Linux, this would depend on bug 1447519, but this codepath was declared as deprecated by bug 1468801. See also bug 1502740 comment 6. Pathfinder is first mentioned in bug 1543981. Since https://hg.mozilla.org/mozilla-central/rev/e79c7b512fd6 it is impossible to use SkiaGL with WebRender.
Bug 1553167 Comment 1 Edit History
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> enabling or disabling WebRender didn't make a difference (AMD 7650k APU + Mesa-19.0 drivers) This is a duplicate of non-WR bug 1529614. For Linux, this would depend on bug 1447519, but this codepath was declared as deprecated by bug 1468801. See also bug 1502740. Pathfinder is first mentioned in bug 1543981. Since https://hg.mozilla.org/mozilla-central/rev/e79c7b512fd6 it is impossible to use SkiaGL with WebRender.