While I was working at LithoArt Pty Ltd, I needed a way to fix a certain bug in the Mozilla ThunderBird Email Client. Creating a new addon was the best solution.
Bug Summary: On the Compose Email Window on a Reply / Forward -> While changing the FROM field drop down, your new signature would ‘stack’ and the old signature would not be removed. Apparently this is the ‘expected’ behaviour for ThunderBird which is very odd.
I created this nifty little addon to fix that issue. I feel there is still room for a bit more improvement in the addon, so let me know if you have any requests. Don’t forget to rate Signature Fixer!