I have been using it for a few days (to replace missing features from Tab Mix Plus in Quantum).

It works. Closes all similar tabs opened, which is great. Two things.

First, it requires a counter which is shown when you right click (then in brackets) a tab to close. It needs to show how many similar tabs exist.

Second, needs a confirmation dialogue when you actually close them (you can always show how many tabs are being closed there).

Right now I am using Foxy Tab JUST for the counter and it's the only way to tell how many tabs get closed.

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EDIT: Developer added the confirmation dialogue, updating to full 5 stars. Nice.

Great addon, if you could add this feature, the ability to close tabs without having to load the page. Often, there will be many unloaded tabs that need to be closed and the only way to close them with this addon is by clicking on all of them.

Literally the only thing holding this back is that it doesn't ask you if it's alright to close more than ten tabs. Accidentally closed 120 tabs by mistake.