If I forward an email from one of my accounts, Thunderbird wants to send it from a different account, but some are personal and others for business.
I may receive an email on account X, or maybe already sent one from that account, but when I hit Forward, it wants to send from account Y. The first may be a business account, the second for personal. Since I actually have more than two accounts, I have to remember to check from which one the forward is being sent, otherwise things get confused, especially when I start getting replies on the wrong one. I installed Folder Account 6.0, but that didn't solve the problem.
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Thunderbird forwards based on the SMTP setting for the account or identity that it was received on. You not going to find an add-on that can intelligently work out which account you want to use when your forwarding mail form an account.