使いこなせなかったのでやめます。

even after i put it to whitelest like youtube (even while the video is playing) it still suspends it after a little while if i'm not on the page

This addon is doing its job good.

It offers user to make several custom adjustments.

Also displays on its addon symbol the number of open tabs, though this is truncated to only 3 digits.

Needs minimal permissions.

But it is very disappointing in heavy usage. A firefox with 1000s of tabs gets very sluggish with this addon, resulting in very noticeable slow response, unbearable delays when switching between tabs.

The settings is unstable or malfunction. Each page is suspend event if I removed it.

The bad first: The reason I disabled the add-on is because every day several of the tabs would get stuck on the suspended moz-extension://301d3d0... URL and wouldn't refresh when I returned to the tab.

The good: Except for the terminology whitelist/blacklist, the functionality of those lists and the un-whitelisted tabs definitely did get suspended.

this extension doesn't work anymore, also import doesn't work. All of my tabs still in the not suspended state. I figured it out because of 2-3 G memory spent of laptop...