Thanks for the reply! It's a really interesting piece of research. Yes, you're quite right, the browser alone can't interact between all the programs, I was purely thinking of low hanging fruit for the browser plugin.

I watched a Google interview with Douglas Engelbart [0] where people asked him a couple of times if Wikipedia was what he'd envisioned for hypertext, he was very polite about it and said it "was a good start", but he'd clearly wished that we'd got much further by now.

What you're suggesting is definitely a step forward.

[0]: https://www.youtube.com/watch?v=xQx-tuW9A4Q