Firefox and Chrome do not share clipboard - what's wrong?
I've had the same issue ongoing now for about a year I'd say.  The only workaround I've found is to restart the browser(s) which is a hassle.  I'd really like to find a solution for this.  I thought it was my older MacBookPro (6 years old) but I just upgraded to a brand new one and the same problem happens on a daily basis.

I'm using macOS High Sierra version 10.13.6
Chrome version 69.0.3497.100 (Official Build) (64-bit)
Firefox version 62.0 (64-bit)