Rated 1 out of 5 stars

This add-on is a great idea that is executed poorly and seemingly hasn't been tested at all on 64 bit windows.

It fails to autodetect anything (except chrome and ie), including thunderbird in which it is installed.
The reason is this that it relies almost exclusively on registry scanning of HKEY_CURRENT_USER\SOFTWARE.
Change the add-on to scan all the relevant places listed below and it would probably be a 5 star plugin and not a complete dud
HKEY_CURRENT_USER\Software
HKEY_LOCAL_MACHINE\Software
HKEY_CURRENT_USER\Software\Wow6432Node
HKEY_LOCAL_MACHINE\Software\Wow6432Node