Created attachment 8554436 [details] Showcase User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:37.0) Gecko/20100101 Firefox/37.0 Build ID: 20150125004007 Steps to reproduce: Set layers.prefer-d3d9 or layers.prefer-opengl to true Actual results: layers.prefer-d3d9 = true: When the Firefox window is maximized, the window buttons for minimize, maximize and close will no longer be in the foreground but become semi-transparent. In the Developer Edition (as of this bug filing FF37a2) the buttons completely disappear. No issues while its windowed. layers.prefer-opengl = true: While maximized or windowed, the buttons get cut off horizontally and the tabs are being cut off as well. Both set to true: Identical to just layers.prefer-opengl = true Expected results: No issues.
Confirmed in 46.0a1 (2015-12-20) Win 7
Component: Untriaged → Graphics: Layers
Product: Firefox → Core
Summary: Issues with window buttons and tabs when using layers.prefer-d3d9 or layers.prefer-opengl → [D3D9] Issues with window buttons and tabs when using layers.prefer-d3d9 or layers.prefer-opengl
Just to say layers.prefer-opengl no longer works for me as of this current Firefox Nightly 50... No info whatsoever in about:support and seems to default to D3D11 compositing no matter what I do. layers.prefer-d3d9 works and same issue with the windows buttons with about:support reporting correctly D3D9 compositing is being used. Same OS and using 64bit Nightly...
Alright about:support now reports layers.prefer-opengl errors so I guess my side is good to go now... Decision Log OPENGL_COMPOSITING Blocklisted; failure code BLOCKLIST_FEATURE_FAILURE_INTEL_OGL_DIS
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