I am using Firefox 76.0 on a Linux Mint 19.3 cinnamon desktop. For some reason I can no longer send a newspaper item by email. Until recently I simply ticked the email symbol in the sidebar, and up popped an email form to which I needed only to put in an address. Now when I tick on the box, there is no result, although there is a line at the bottom of the page, saying 'mail to, and name of article'. I have disabled all add-ons, and the result is the same. It is the same when I have tried on other browsers. However, on another computer in a different room with the same setup, there is no problem. I have torn out my hair for three days and would be very grateful for help.