Compatible with Autohide Tabbar Rated 4 out of 5 stars
It turns out that Autohide Tabbar is actually resonably compatible with VertTabbar. It's not perfect, but it works.
Autohide Tabbar: https://addons.mozilla.org/en-US/firefox/addon/59267/
Suggestions Rated 4 out of 5 stars
I tried to email the developer with the following feature requests, but I seem to be blocked (as spam) by his mail host. Does anybody else want to try? (Don't forget to leave a comment here and tell if you succeeded.) The email address can be found if you click the link to the git-repository.--Thank you for VertTabbar -- it's an excellent extension!I would like to propose the following additions: * Auto-hide: A optional state in which the bar remains hidden, but appears if the mouse pointer comes close. (Currently, something like this effect is present if the browser is in full-screen mode)* A way to resize the width of the bar (when it is in its normalstate), by dragging its border.It this seems to be too much work, then a somewhat more lightweight butstill useful feature would be this:* A little button (perhaps an arrow) to *collapse* the whole bar so that the web-page can occupy the whole of the screen estate. And then,of course, there needs to be a button for expanding the bar again.