"This add-on is not actively monitored for security by Mozilla. Make sure you trust it before installing."

um, why is the source code then not available at one click? that would be the only way, in the absence of a web-of-trust clue

I know, underhanded code, and check again at every update - but still, some of these add-ons aren't huge piles of code

but

if there's a link, it's too well hidden. I really can't find it. Am I meant to do a web search?

bravo for the unheedable warning