User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:56.0) Gecko/20100101 Firefox/56.0 Build ID: 20171024165158 Steps to reproduce: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:56.0) Gecko/20100101 Firefox/56.0 When clicking on an element in the sidebar of a FF window which is not in focus, two clicks are needed instead of one. Example: I have two FF windows open. One of them is not in focus. Its sidebar presents the bookmarks. I click on "Other Bookmarks". Actual results: The FF window I clicked on is now in focus, but the "Other Bookmarks" folder does not expand. I have to click it again. Expected results: The "Other Bookmarks" folder should have expanded after one click instead of two. This is the behavior I expect from basic browser ui elements (e.g.: buttons in the toolbar).
Closing the sidebar via the X-button only needs one click.
Please close this bug and consider Bug 1416492 instead.