Very good Rated 4 out of 5 stars

I find it very convenient. Thank you very much for this creation. Perhaps, you should give a shortcut key to switch on and off vietnamese input

This review is for a previous version of the add-on (20061001). 

Shortcut keys

Newer versions of the extension use Ctrl+Alt+V (Cmd+Opt+V on the Mac) to toggle AVIM on and off.