I actually stopped using Firefox because Send Tab URLs stopped working and 2/3rds of my web research had to be sent to someone else via e-mail.
"Copy all tabs" almost replaces the "Send Tab URLs" which would open a new e-mail and paste your formatted list into the mail. "Copy all tabs" can format the URLS with the title of each tab "title&URL" option and send it to the clipboard, the user still has to start a new e-mail and paste which is allot better than manually copying URLs. Thanks Mr. Pezza!