I was once a warrior on the PK front. I built a PK Chrome extension called Deeper History http://lifehacker.com/deeper-history-searches-the-contents-of-visited-

I was once a warrior on the PK front. I built a PK Chrome extension called Deeper History http://lifehacker.com/deeper-history-searches-the-contents-of-visited-pages-1502340820 http://lifehacker.com/deeper-history-searches-the-contents-o.... It compressed and stored pages you visted in IndexDB. You could then search your history by keyword form your url bar. An example use case was trying to recall a comment of an article you liked. If you could remember a few of the words DH would pull it back up. I stopped developing it once I realized it was a security nightmare. I built a version that encrypted the data before storing it but that ballooned the DB size and I also didn't have a user-friendly way for users to obtain a key set.