Created attachment 8935403 [details] 2017-12-07 22_19_07.mp4 59.0a1 (2017-12-07) (64-bit) on OSX steps to reproduce: 1. install https://addons.mozilla.org/en-US/firefox/addon/quantum-lights-dynamic/ 2. create a new window expected result: new window opened with theme already applied actual result: massive flickering. see attached movie. stepping through the frames it looks like the following is rendered: 1. solid aqua background (default for theme?) 2. my previous theme (https://addons.mozilla.org/en-US/firefox/addon/quantum-launch) 3. quantum-lights-dynamic 4. solid white background 5. quantum-lights-dynamic
This theme is using the Themes.update API after the window has been created to set the styles on the window. So I don't think we can 100% get rid of the flickering but we should be able to remove steps 4 and 5 from the list in comment #0.
(In reply to Jared Wein [:jaws] (please needinfo? me) from comment #1) > This theme is using the Themes.update API after the window has been created > to set the styles on the window. Is it a bug of the theme or a problem with the provided theme API that these styles set by the theme on the window can't be applied before first paint?
Component: Theme → WebExtensions: Frontend
Product: Firefox → Toolkit
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