I honestly thought that first of all, Firefox Focus did operate in a sandbox, and second of all, that it was available on Desktop platforms. I'm chagrined to see that neither of these is true. I absolutely agree that Firefox needs a security sandbox ...
Yes, please, I logged in today just to say this. I switched this week past to the new interface, and that delete/trash button in the cards view would duplicate what Microsoft Outlook has. It's so much more convenient to be able to immediately delete ...
I have found that if I switch tabs, and then switch back to my original tab, the Copy command will no longer be greyed out, and will function normally. It's super annoying, but it's a workaround, at least.