The shortcut to move a window between monitors with middle mouse click triggers in in places in Firefox.

It works as expected on the menu bar, or the space between tabs and the minimize/maximize/close buttons. But it also triggers when middle clicking empty spaces in other toolbars. For example, in the bookmarks toolbar, there is a small gap of about 5 pixels between each bookmark - middle clicking there will move the monitor. There's also similar gaps between the address bar and other icons, or between add-on icons, that can trigger the move.

The bookmarks one is particularly annoying because I usually want to middle click them, and a slight misclick can cause the window to move. It's also just unintuitive behavior.

Windows 11 Pro, Firefox 153.0.4 (64-bit), I tried the latest stable version of DisplayFusion and v12.1.1