Oh yes launcher.html is required, thanks Dan. Setting dom.disable_window_move_resize=false is also be required (along with layout.css.column-span.enabled=true of course)
Bug 1548896 Comment 7 Edit History
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Oh yes `launcher.html` is required, thanks Dan. Setting `dom.disable_window_move_resize=false` is also be required (along with `layout.css.column-span.enabled=true` of course)
Oh yes `launcher.html` is required, thanks Dan. Setting `dom.disable_window_move_resize=false` is also required (along with `layout.css.column-span.enabled=true` of course)