Reduce annoying 404 pages by automatically checking for an archived copy in the Wayback Machine. Learn more about this Test Pilot experiment at https://testpilot.firefox.com/
It would also be nice to link to this repository from the addons.mozilla.org page, perhaps as "Support Site", so that users could more easily find the sources and contribute.
The Wayback Machine add-on description on addons.mozilla.org incorrectly lists this add-on as being licensed under the GNU General Public License, version 3.0 while the source files in this repository show the GNU Affero General Public License, version 3. Presumably addons.mozilla.org should be corrected.
Thanks, Kevin