Vlad Actually, you don't have to change link every time. I found a Firefox extension GitLab and the only thing you need to install the extension is to click on the latest .xpi file and then click Add button.
Even though the extension was removed from the Firefox store, it's still signed by it, so you won't have any issues installing it. And IIRC the extension has an auto update feature after manually installing it.
So, I guess you can leave a link for the latest version and don't ever care about it, the extension should auto-update itself if it's an outdated version.
