[orca-list] "Firefox" and "Thunderbird": install add-ons from the hard drive

[Max <heavy9922 gmail com>]

Hi, All.

As far as I know, "firefox" and "thunderbird", you can install add-ons, 
which are stored on the hard disk. Initially, this function was 
available in the menu; But then - it was moved to the additions tab.
Is it possible to somehow get to this function using the "orca"? I tried 
several times, but could not find this feature.
It is not so often needed, but periodically people ask me about it.