User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0 Build ID: 20171112125346 Steps to reproduce: From Full size screen, clicked the button to the left of the X (close) button, far upper right of screen. It's the one that appears when the screen is at full size, and it looks like a couple of pieces of paper stacked on top of each other. Actual results: Nothing. Expected results: Expected the window to go back to the last size smaller than full size, allow resizing using arrows.
Component: Untriaged → Widget: Win32
OS: Unspecified → Windows 10
Product: Firefox → Core
You need to log in before you can comment on or make changes to this bug.