This was my initial concern. Though this is something I want, and I'm surprised isn't built into modern browsers. I'm less interested in having a cache of images, but useful search of my history, which I think could be stored locally, would be helpful. We don't need the search to be particularly clever I wouldn't think. Even straight string search of cached text from the webpages I've viewed would be valuable. I don't need all the images, video, javascript, etc cached.