Developer reply by Realraven (Axel Grude)
Rated 1 out of 5 stars
I used to love ToneQuilla but try as I might it just won't install any more - either from file [tonequilla-1.1.0-sm+tb.xpi] or directly. OS10.6.5 and now 10.7.2 on a new Mac. Thunderbird version is now 5.0.
The install always "appears" to work and it appears in my add-ons list. Then reboot Thunderbird to activate it and it's vanished. Every time.
If you are running Thunderbird 78 or later, you can now add sounds via FiltaQuilla instead.
To create your own collections, you must have a Mozilla Add-ons account.