once installed, If the addon developer doesn't include a link, theres no way to get the original URL without doing a search.Such a necessary feature somehow not implemented.Some developers switch out their extensions and upload a new one with the same name and hide the old one.no way to tell which one you have.
Yes, and I don't understand why a basic function like this wasn't implemented from the start.
I used to use a workaround by clicking on the "Reviews" link at the bottom of an addon's page in the addon manager tab (about:addons), which took me to the addon's AMO reviews web page, which itself contains the link to its [addon] home page : but I've just noticed today that even this "Reviews" link has disappeared from the addon manager tab. I just don't get it.
On desktop, one can use the rating link @GGoih64jh mentioned. Starting from Firefox 117, that rating link is always visible for add-ons installed from AMO: https://bugzilla.mozilla.org/show_bug.cgi?id=1841619On Android: Starting from Firefox 120, one can always access the add-on listing page by tapping on Details > Rating, as explained at https://bugzilla.mozilla.org/show_bug.cgi?id=1858199#c4
Thanks -- Ed