Comment 12 for bug 1930700

Bug 1667977 currently means that on Windows there's a possibility of content processes crashing if the user installs/removes a bunch of fonts while the browser is running (so we get a flurry of notifications that trigger repeated, overlapping updates to our font list). This is probably not a common situation -- most users aren't installing and removing fonts frequently in the midst of a browser session -- but still, I'd be reluctant to ship something that is known to be crashy in such a scenario.

So I'd definitely prefer to have bug 1667977 fixed before it rides to Release. I've been attempting to debug but it's proving difficult to track down the root cause at the moment. (Not having a tool equivalent to rr or pernosco on Windows hurts...) I'll try to spend some more time digging into it this week.