Selecting File SEND LINK creates havoc with tabs
When I click on FILE, from Firefox menu, and select SEND LINK, the browser begins flashing as hundreds of tabs race across the screen in rotation.
Every time Firefox opened
You don't have Firefox selected for "mailto", do you?
No, Thunderbird is the default. I also tried it with TB open, and it with it closed, no difference. Cannot use Firefox to send a link on Windows 7.