It works sometimes but usually makes the tabs experience worse for me, many of the tabs are not suspended properly but end up in a sort of weird in-between state where they end up kind of broken, such that clicking on them or even refreshing them won't make them load, you have to copy past the URL in a new tab to load it.

Worst part is once you have a bunch of suspended tabs, you can't even get rid of this extension as without it you can't load those tabs anymore, you have to click the triangle play button to first load all these suspended tabs one by one and then you can finally uninstall this button.

I wish there was a add on that just collected URLs in a list and let you then let you load them in new tabs as you wish, rather than this approach of suspending the tabs

The addon would be very good if it worked properly, when loading some pages appears on the page only a cryptic text and I'm no longer on the original page, very bad. The addon page does not bother to load even though it is on the whitelist.
I will deactivate it as long as the errors have not been fixed.