Thanks for the review.

1. No, that's not possible for WebExtensions.

2. I don't know what "personal bar" means, but New Tab Override doesn't change anything with regard to toolbars. Do you mean the bookmarks toolbar? Firefox has a setting to a) always show the toolbar b) only for new tabs (but that's only the case when you override it with this add-on!) or c) never show it. I guess, you should use a) in that case.

Thank you!

Thank you!

Thank you!

Thank you!

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.