Recently, I've found that the OSX keyboard shortcut for focusing the next window in the current application ("Move Focus To Next Window" in System Settings) has changed its behavior. Pressing [cmd + `] will only cycle Firefox's windows until it reaches what seems to be the "end" of the current list of windows open. After this, I have to press [SHIFT+ cmd + `] to go backwards through the list of windows to re-focus any of the other windows. Before, the behavior was such that I could just repeatedly press [cmd + `] and Firefox would infinitely cycle through all open windows, no shift key needed. I haven't been able to reproduce this changed behavior in any other applications. Testing this in others (Finder, Safari, etc.) yields the cycling behavior instead of making me reverse the direction with shift to get back to the previous windows. This is tied to the operating system's command. If I remap the keystroke to something else in system settings, I still need to use the shift key with it in Firefox once I reach the last open window. Is there a way to get the old cycling behavior back? I find the key command with the shift key to be much less ergonomic.