Great! This is what I need!

Perfectly executed code, simple and does the job. Thank you for sharing it with us! <3

Je retrouve une des fonctions que j'appréciais dans Tab Mix Plus (obsolète). Quand on travaille sur un onglet qui se trouve à 30 onglets de la fin et qu'on en ouvre un nouveau depuis le courant, c'est super de l'avoir juste à côté plutôt que de dérouler jusqu'à la fin de la liste... Par contre on ne peut pas différencier le comportement entre un nouvel onglet vierge et un ouvert depuis l'onglet courant.
J'apprécie tout de même cette petite extension.

Thank you, very much :-)

Works just like you would want to, most of the time.

Can you add an option that only put tabs opened by current tab to the right? But still put new tab opened by click "+" and bookmark to the last.

This replaces part of the functionality lost in tab mix plus!!

Works in Firefox 57.0a1 (built on 2017-08-14)

Thanks a lot!

Could you add an option to switch to the left tab when closing the current tab?

This used to have an option to "Enable for new tab button" or not. Is there any way to bring it back?

And as usual Firefox mavens are responsible for the one remaining annoyance with this workaround, the scrolling of the new tab into the first visible location on the tab bar. My time with Firefox is drawing to a close as my chrome setup is getting very close to replicating my preferred firefox behaviour. Regardless of the idiotic decsions of the powers that be at mozilla, thanks very much for your efforts.

Is it supposed to work on Android 7.1.1 Firefox? Because it doesn't on mine.