Excellent.
Though at the early time it might be confusing for new users.

解决了我的大问题,希望可以提供快速添加的功能,我需求比较多,一次能添加一百个就好了

Great add-on; please consider adding the ability to sort the containers based on various criteria like name and date created.

This containers app is so useful and awesome, definitely gives firefox an edge (no pun intended) over other browsers!

good!