IIRC, once upon I time I used only the mouse for copy-and-paste, which I consider way superior to the Windows-like Ctrl-C Ctrl-V complication. Now after many years I'm slowly starting to use Linux again and to my horror I see that it doesn't work anymore, except between Emacs and terminal windows. Of course, the keyboard shortcuts don't work in Emacs, so it's a real pain e.g. to copy from Emacs to Firefox.
Is there a way how to fix it? I mean I want to use marking and pasting using the mouse only everywhere, not the other way round.
I'm not asking about clipboard managers, I need neither clipboard persistence nor multiple clipboards, but if it solves my problem, I'll go for it.