Hello, Whenever I try to open Firefox, it shows up rapidly on the current space but then disappears to move to the space where it has been closed the last time I used it. For example : I have 3 spaces. I am on space 2 with Firefox open, I close it. I go back on space 1, open Firefox -> it will open on space 1 and then immediately the window will disappear to appear in the space 2. If I move Firefox to space 3, and close it (CMD+Q), the next time I'll launch it, the window will appear in space 3 no matter from which space I launch it. Not my native language I hope I've been clear enough sorry. And of course, when I right click Firefox on the dock, under Options, the value of "Assigned To" is "None". (already tried to assign it to a space then go back to none but it doesn't work). This behaviour only concerns Firefox. All others apps behave like it should : open in the space I'm in.. If you have any idea.. My current macOS version is : macOS Catalina 10.15.4 Firefox version is : 75.0 Attached: a screenshot of my mission control settings (which are not the problem I think but just in case) Thanks and have a nice day, Amine