Okay I have more findings. On windows, If RFP is on AND firefox does a early blank first paint, firefox doesn't resize, on OSX it does. I can't really tell the reason though..
Bug 1951690 Comment 7 Edit History
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Okay I have more findings. On windows, If RFP is on AND firefox does a early blank first paint, firefox doesn't resize, on OSX it does. I can't really tell the reason though.. Edit: if shouldCreateWindow returns false, and browser.startup.blankWindow if not False, then the resize doesn't work.
Okay I have more findings. On windows, If RFP is on AND firefox does a early blank first paint, firefox doesn't resize, on OSX it does. I can't really tell the reason though.. Edit: if shouldCreateWindow returns false, and browser.startup.blankWindow if not False, then the resize doesn't work. Somehow SetupSkeletonUIPrefs affects this process.