Simple solution for those who don't want to do it through "about:config".
Otherwise do as stated :

by moziloper, 2 years ago
I think this extension only simplifies the manual inclusion of this option: "browser.tabs.insertAfterCurrent"

This can be done manually using two steps:
1. Type in the address bar: "about:config?filter=browser.tabs.insertAfterCurrent".
2. Set to "true" by double click on it.

Done.

重新安装浏览器，用着用着想起还有你没有安装 哈哈 很依赖了。和Tree Style Tab这个插件起冲突了。两者选一我还是选你了

Simple, great add-on. I use Vivaldi as my daily driver, and this is a feature, it should be in Firefox too.

Your addon after update was deleted./Twój dodatek po aktualizacji został usunięty.

many thanks

thanx for pointing to the procedure in quantum