I haven't tried to load it to see if it will verify (i.e., whether it's a perfect copy).
According to a cached copy of the old page, it was released under the MIT license, which would make it free to modify and redistribute subject to some minor notice requirements. So it can live on if someone wants to move it forward. (There seem to be a lot of repositories on Github, but perhaps not specific to Firefox?)
They are located in your profile directory under extensions.
Finding them is more challenging for most, since most don’t have named IDs. I am willing to bet this one does though.
For addons that don’t, you can find the ID by going to the addons page, hitting “debug addons”, then looking for your addon on that page where it will list the “Extension ID”, which should be the name it’s saved under.
AFAIK, you can find all installed XPI files in $MOZCONFIG/firefox/<profile>/extensions/You can find and access your $MOZCONFIG/firefox/<profile>, via about:profiles
PS: The XPIs dont contain the configurations of the individual extensions.
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