I think Firefox’s “shift + right click” to bypass context menu blocking should be adopted by all browsers.

Yeah, it's one of those features where after getting used to it you just can't understand why not every browser has it. I remember trying to copy an image from OneNote and conveniently in the custom content menu there is a button to copy the image. The only thing it does however is tell you it doesn't work and to use Cmd+C instead, which doesn't work either. So Shift + Right Click saves the day again.