Hello, I have been using this Addon and I haven't seen this listed in the Gnuzilla Addons page. I think it's similar to Compact Menu (I haven't used this before), and the download page explicitly states that it is under the MIT/X11 license.
The link to the download page is https://addons.mozilla.org/en-US/firefox/addon/1455/ and the latest version is 2.0.2 . Regards, Gian
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