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Reproducible on Firefox 37.0 build 2, Firefox 38 beta 1, latest Aurora 39.0a2 and Nightly 40.0a1 e10s on/off Affected Platforms: Windows 7 64 bit (2 different machines) Steps to reproduce: 1. Launch Firefox with a clean profile. 2. Go to Add-ons Manager -> Plugins tab 3. Lock screen and wait ~1 minute - until OpenH264 or DRM plugins, where applicable, are installed. Expected result: Both plugins are installed (gmp-eme-adobe and gmp-gmpopenh264 folders are available via user profile folder). Actual result: "..will be installed shortly." message is displayed for both plugins. Painting issues at click on any plugin. Notes: 1. Screencast: http://goo.gl/XQhpNB 2. Not reproducible on 1 screen Windows machines, Ubuntu (1 and 2 screens machines) nor Mac OS X 10.9.5. 3. Regression range (m-c): Last good revision: 035a951fc24a First bad revision: f1f48ccb2d4e Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=035a951fc24a&tochange=f1f48ccb2d4e
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