AFAIK, the only way is to put the extension ID into a search engine.
DuckDuckGo finds {a300a000-5e21-4ee0-a115-9ec8f4eaa92b} at https://reviewers.addons.thunderbird.net/En-us/thunderbird/addon/removedupes/reviews/247340/
For Firefox extensions, there’s a better way, but it doesn’t seem to work on addons.thunderbird.net: