Hi This feature is not currently available in the desktop version of Firefox, but is something that may be included in a future update. If you want to leave feedback for developers, you can go to the Firefox ''Help'' menu and select either ''Share ideas and feedback…'' or ''Submit feedback…'', depending on your Firefox version. Alternatively, you can use [https://connect.mozilla.org/ this link]. Your feedback gets collected by a team of people who read it and gather data about the most common issues. You can also file a bug report or feature request. See [[File a bug report or feature request for Mozilla products]] for details.