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 that sounds a lot harder than it is in outlook. at least with outlook, you can highlight an email, press the applications key, and go to rules, and create, and it bases the rule off that email, so lets say you want to have part of the subject be the rule, I don't know, lets say something lie [blind hams]. you just have to take the rest of the subject out, but leave that part there, and then when you create it, you can tell it to look at all the emails in your inbox, and run that rule on the emails that are there. if this makes sense.