Some websites display warnings even though everything works fine, like web.skype.com. But that’s the closest thing to doesn’t work I’ve ever seen on Firefox.

What about Apple’s WebKit? Does it count?

This is not a good method, but…

I think I’d specify an a number… let’s say, 2/3 of the books get to survive, the others will be thrown away. Then I’ll start seperating them into three groups; the ones I become immediately sure are great books, the ones I’m sure are trash, and ones I’m unsure about. Then I’ll go random: if I chose too many books as good ones, I’ll randomly take some of them out, unless I’m sure they are all great books that should stay in the library. Or start randomly adding books from the unsure pile to the ones that get to stay.

Well. Not a great method.

Maybe try delta.chat? I use it, and it’s quite good. Just make sure the guaranteed end to end encryption thing is on.