I think there's a lot to gain by locally indexing the pages you've already visited. I am constantly opening the same reference pages.

Google / Chrome won't do it because every time you search they push ads. I wish Firefox would have tried since Mozilla (historically) wasn't an ad company. Build features your competitor won't.

> The vast majority of my browsing is limited to a handful of sites that I already know.

Which is why search is at the local equilibrium it is.