Copy&paste via menu works (I didn't think about it) and Ctrl+Shift+V works too. Ctrl+Shift+C opens Firefox's Developer Tools. It's difficult to find a reasonable shortcut.
I don't believe I've ever seen Ctrl+insert and shift+insert makes to anything _other_ than copy and paste.
Why have everybody kept using Ctrl-Shift-C and Ctrl-Shift-V since forever included myself?
Copy&paste via menu works (I didn't think about it) and Ctrl+Shift+V works too. Ctrl+Shift+C opens Firefox's Developer Tools. It's difficult to find a reasonable shortcut.