This issue is not related to New Tab Override at all. It's a known Firefox bug that can happen under certain circumstances.

Thanks for the great rating!

Thank you!

Danke!

You can use moz-extension:// URIs now. In the future, please request features via appropriate channels instead of abusing the review system. Maybe you want to consider a better review now as your only point of criticism was addressed.

Thanks for the review!

Thank you!

It's technically not possible to support Firefox for Android as Firefox for Android does not have a tabs WebExtension API.

Thank you very much! :)

It would be nice if you would ask before giving bad reviews for add-ons since what you want is not possible at all for WebExtensions. As there is no way to this, it's not fair to get a bad review for that reason. And by the way, 70,000 other users don't think that the add-on is "useless".

Thank you very much! :)

Thank you very much! :)