A wonderful add-on to do for your tabs what GeekTool does for your desktop. It delivers an easy to use interface to embelish your new tabs and at the same time make them more useful.
At the moment of writing the extension has been stable and worked correctly on Firefox 54.
Absolutely recommended :)

EDIT: One proviso though.
If you happen to have your Firefox Preferences set to "Never Remember History", Tabliss WILL forget all your settings between sessions. If that is your behaviour then, for the moment at least, Tabliss will be not much more than a beautiful picture, the time and a basic greeting every time you open a new tab.

Very nice looking new tab page

It's fun to see quality work from talented people with the knowledge they are designed to make my use benrfial to me. Thank you all very much.

Very Good!

Like it very much so far. Maybe the best app of this sort around.

I also have some suggestions
1) Add some more settings to the widgets. For example make the time widget movable to another position (middle only looks kinda bad on some images) and it should be able to show date as well as time
2) The image should have an option to start from bellow the bookmarks bar not automatically stretch from the top of a window. Looks really bad if you have a face or something like that on your image and half of it is missing then you have to manually crop it and it's a bother.
3) I would also love an option to full-screen the image after some time of inactivity in browser something like screensaver but with all the info you've got set in the widgets

but anyways keep your good work and thank you.

It's simple, convenient and nice looking. It's also the only extension I've found that can actually affect my new tab page.

Une extension légère, modulable avec facilité et dans laquelle vous pouvez, comme je le souhaitais, utiliser vos propres images pour enjoliver votre navigateur favori. Chaudement recommandée !...

Nice !

I Like it. Pretty neat

My go to for new tabs. Images are stunning quality. And the dev is super responsive and awesome to feedback. Weather is now in metric and text can be centered. Thank you!

Good design and fantastic flexibility! Love it a lot!