My previous review (for version 1.2): Does what it says, but would be nice to use my own sound - not a fan of the one included. Five stars for custom sound files. :)

Developer responds that Extensions cannot access local files.

I used to use Download Status Bar, which allowed use of custom sound files. But that's not an Extension and won't work in newer Firefox. So maybe not allowing access to local files is new in Extensions. If so, that sucks. If not, please keep trying! :)

I appreciate the new volume adjustment and other notification options.

Rarely, for reasons unknown, it will turn itself off. Simple and quick fix of Disable then Enable (no need to restart Firefox), so only a minor annoyance. Doesn't happen often though.

Otherwise, a great Extension!