This plugin used to be the reason, that I used FireFox, now there is no reason anymore. While I understand, that the changes were triggered by Mozilla, it means, that the plug-in doesn't help me anymore. For similar functionality I could use any kind of OS based windows tools.

Even for just windows oriented "tiling" I can't use it anymore:
- double click on the tab doesn't work anymore
- using new layout moves tabs to another display, therefore unusable in multi display environments.