Forum Moderators: open
on the right hand side of my Firefox browser there is a three horizontal bars button.
I clicked that and then clicked "Customize".
I then dragged the aggravating "Hello" thingy off the toolbar to the area below.
It has remained there even after updates.
You can reverse this procedure with "Email Link" button.
I have, it seems, a much more reliable version of Firefox than you. ;)
Everything works perfectly to my requirements. :)