Hey, I'll see if I can add your suggestion in a future release.

Extensions with more than 10k users are actually manually reviewed by Mozilla, same for
'Recommended' extensions, but you can review the code using this online tool: robwu.nl/crxviewer

Cheers.

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Reply:

I don't know. Someone asked them, last year, to remove that warning from all non-recommended extensions that are manually reviewed, but, unfortunately, nothing was done yet:

https://connect.mozilla.org/t5/ideas/addons-store-should-show-which-addons-are-quot-actively/idi-p/88832

About the second question, I never hosted the code on a code hosting platform yet.