#contentAreaContextMenu{ margin: 20px 0 0 20px }

Hi. There is this at least three years old GUI bug that is not yet fixed, I'm writing this post to show the temporary workaround and hopefully get more interest in the bug itself. This would be an urgent usability bug, but it's still here because probably not everyone can reproduce it. Link to one of the bug reports: https://bugzilla.mozilla.org/show_bug.cgi?id=1504021 > Description Removing the title bar doesn't set an offset for the right-click menu → the right-click menu will appear slightly wrong positioned, with its first entry below the mouse cursor → the first entry of the menu will get a mouse-release event and will trigger. The effect of this can be different depending on what you right-click: * right-click some empty area in a web-page: you will be taken back to the previous page (because the first menu entry does that) * right-click a link: you will open the link in a new tab (because the first menu entry does that) > Steps * Have a non-maximized Firefox window. * Disable the title bar (through the "Customize..." option) * Right-click anywhere on a webpage: you will be taken to the previous page. > Workaround Enable user styles by setting toolkit.legacyUserProfileCustomizations.stylesheets to true. Create "chrome" folder in your profile directory. Inside, create "userChrome.css", and write: #contentAreaContextMenu{ margin: 20px 0 0 20px }