Hi!
So most (all?) of the time it seems to fail to automatically submit pages to be archived.
But today I noticed that it also fails to open archived pages. When I clicked on the items in the addon's menu the URL opened was truncated to have the original website's TLD and not the actual URL of the page. So of course it didn't load what it was supposed to.
(The menu still shows to proper url for web archive.)
So I guess this fate is typical for free addons. The question is did anyone pick up the development to make the addon functional again?