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When a lightweight theme is used, the titlebar can no longer be dragged or otherwise interacted with. This applies to the built-in Light and Dark themes as well as themes from AMO. Applies to latest nightly, browser.tabs.drawInTitlebar = true
Using MOZ_GTK_TITLEBAR_DECORATION=client fixes this for me. I tried with the built in firefox theme and 3 gnome themes(arc, adapta, adwaita). Also I think fixing the bug https://bugzilla.mozilla.org/show_bug.cgi?id=1423869 might fix this
Comment on attachment 8950923 [details] Bug 1423851 - Enable titlebar/menubar drag on lightweight themes, https://reviewboard.mozilla.org/r/220178/#review226150
Attachment #8950923 - Flags: review?(dao+bmo) → review+
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/autoland/rev/d4937a53d826 Enable titlebar/menubar drag on lightweight themes, r=dao
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