using Thunderbird and want to create a different email sound for each account that you have? Well, now you can, with Filtaquilla. You can also do many more things with this banana of an extension: https://services.addons.thunderbird.net/En-US/thunderbird/addon/filtaquilla/
FiltaQuilla

Adds many new mail filter actions - launch a file, suppress notification, remove star or tag, mark replied or unread, copy as "read", append text to subject.

@mcourcel I want to be able to make rules in betterbird, not thunderbird, but I can't for the life of me figure out how to make rules! grrrrrrr!
@JamminJerry So shift+tab until you hear your inbox folder, up arrow to the account and then Shift+f10. YOu can set message filters in that menu.
@mcourcel I will have to try to play around in there to try to make rules. thank god betterbird is portable so I won't lose my rules if I have to redo windows like I do with outlook. lol.
@JamminJerry Yeah, make sure your folder pane is checked under the view menu and layout.