What does "Close all trusted" mean?

I really like this plugin: does what it has to, simply and easy.
Edit : version 1.7 solved a small issue version 1.6 of the plugin had with Waterfox,
François solved it swiftly, so thank you very much for that.
It's working perfect, as it did before.

Brilliant add-on. Really really useful. Much better than the other one that just deletes duplicates, this one is actually useful. Use it on those days when you realise you have 60 tabs open, some of them important and you think "lets see where the duplicates are and remove those at least before I figure out the set I'm really using right now and what to do with the others". I thoroughly recommend it. Wasn't sure whether to give it 5 or 4 (Mozilla doesn't let you give it 4.9 stars). Faults: 1. The video on youtube is too fast, I'm not a computer! 2. Terrible name. It does what it says on the can yes, but a shorter name with the details in the explanation would be better. ok these are not reasons not to use it. It does do *exactly* what I want and what many other devs will need. In the end I've given it 5 so that it is more findable as its so good.

Andy

Click on the button and you have a little popup proposing you to order your tabs by title or url. Plus a list of your duplicate tabs allowing you to click and compare tabs with the popup staying open. The kind of smart behaviours that we're getting less accustomed to see in nowadays' software. Thank you for this addon.