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Complete waste of time for my purposes. I have spent almost two days trying to accomplish one simple task, or at least,one task that sounded simple when I started trying to figure out how to do it twowhole days ago: When a new email comes in, I want a notification with the subject line. Mozilla helpfully deleted this ability from the Mac version a while ago, and everybody everywhere says "Use Filtaquilla! Use Filtaquilla!" Well, if Filtaquilla ever provided some way to do this, the documentation doesn't exist anymore, and every single thing I tried (from launching a shell script to running an applescript command to using a javascript alert) either had documentation that was flat-out wrong, documentation that simple didn't exist, documentation that consisted of nothing but a broken link, etc. This has been a huge, frustrating waste of my time and I wish I had never heard of this add-on. There is no point to developing a complicated addon if it is not possible to find documentation for how to get it to work right!

I could have spent much less time simple finding another email client, one which will actually tell me WHAT EMAILS ARE ARRIVING.

Questa recensione riguarda una versione precedente (3.1) del componente aggiuntivo. 

This sounds like a feature request - why don't you raise an issue on the github:
https://github.com/RealRaven2000/FiltaQuilla/issues
Just push the [New Issue] button and I can help you deal with it. Remember the review tool isn't really a good place to help you. Note that the notifications at the moment are done by Thunderbird, but a new "custom notification" action might add some value for other users as well. It's actually much harder to suppress the built in notification than adding new ones.