Hi Andrew, that would be useful.

As far as I can tell, the Mozilla Add-ons Site API doesn't return that detail:

https://mozilla.github.io/addons-server/topics/api/addons.html

You can use an online code viewer to see the manifest.json file, which would have the information, but it's a little inconvenient. What I do is copy the URL of the extension's page and then paste it over here:

https://robwu.nl/crxviewer/

Then click manifest.json to read whatever details I'm looking for.

I just noticed he has an add-on version, but it requires a lot of privileges:

https://addons.mozilla.org/firefox/addon/crxviewer/

I wonder how hard it would be to streamline that to just reading the manifest.json file?

Thank you - that works, although as you say it is quite inconvenient. I'm not going to run the add-on version.

I hope the Firefox team will look at adding this capability in future.

fyi, I'm currently running 12 extensions. Following the above process, I found one of them is currently v3.