Place tab bar at the bottom like the feature in TMP

[AngelOfDarkness]

Hello there,

can I place the tab bar to the bottom of the browser (FX 57.0a1 Win10 64bit), like the option in TMP ? Is there any way/script for the userChrome.css ?
The only scripts I found sets the tab bar under the tool bar / navigation bar or under the bookmarks bar.

Thanks for any ideas and with best regards

AOD

[geobomatic]

your best bet is to ask this to the team doing the past experiment Tab Center: https://testpilot.firefox.com/experiments/tab-center

but I doubt it's possible with the webextensions API

[AngelOfDarkness]

Thanks for ya replay

but I don't want to use the webextensions API, I'm looking for a direct way to do this with the userChrome.css if it's possible.
And 4 the tab center team I don't find any contact (mail) adress, but it's a good idea.