Hi: There is no response on this page. Does your "duplicate" comment mean this has been answered, or that someone will respond at a future date, or that no one will respond? Leon

Hi,

This is currently unavailable in Firefox for Android but 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 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.