Steps to reproduce:

1. Set gfx.e10s.font-list.shared to true.
2. Restart Firefox.
3. Right-click.

Actual results:

The font in the context menu shows in Arial instead of Segoe UI.

Screenshot https://1drv.ms/u/s!AgMN9yoqpWv5i1pYd6kLC_z1OZGu?e

Regression range:

autoland: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=8b0c5e44d937513e87b21fc0bc428b8b00adc0ea&tochange=a0c57ddf072577c513ec7f72cf9b427a0d10c826

mozilla-central: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=b6d154b2309846531934289c1e167208fc385ac3&tochange=3d0e35ab6850e792933737ac827b08ebd1fa49a6

Regressed by: bug 1513337

Marking as NEW since we have a regression range.
Dao, it seems that your patch in bug 1513337 caused this regression, could you have a look please? Thanks

If this is an easy fix I'm still happy to take a patch in 70 beta.

(In reply to Liz Henry (:lizzard) from comment #3)

If this is an easy fix I'm still happy to take a patch in 70 beta.

gfx.e10s.font-list.shared isn't enabled by default yet so 70 isn't actually affected.

Also I don't see how bug 1513337 could be meaningfully related to this. Are we sure about the regression range?

Attaching the reporter's screenshots here for convenience.

Looking at the images, it's not just the context menu; the tab title also uses a different font. The URL bar text looks like it matches, though (difficult to be entirely sure, as so little of it is visible).

I wonder, does this reproduce on Win10 or is it Win7-only?

Pushlog for fix range:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=b76411ee5a2d4ae3d11c0ba9cb0b2d21d44db53b&tochange=f65904c67692c40fc2cd596406116e60edc64872

This bug has been fixed in bug 1578154.

I have reproduced this issue using Firefox 70.0a1 (2019.08.05) on Win 8.1 x64.
I can confirm this issue is fixed, I verified using Firefox 71.0b6 on Win 8.1 x64, Ubuntu 18.04 x64 and macOS 10.15.

I can confirm this issue is fixed on Win 7 x86.