Not quite what you asked, but perhaps interesting either way: I recently made an extension that keeps text only copies of all visited sites for offline usage [

Not quite what you asked, but perhaps interesting either way: I recently made an extension that keeps text only copies of all visited sites for offline usage [1]. No full text search included. Might be that grepping through the extension data is reasonably fast, even with multiple years of browsing history, however. I too see this data as valuable, so it's probably better to start capturing now and migrate somewhere else later, rather than wait for your desired browser to implement it. [1] https://addons.mozilla.org/en-GB/firefox/addon/local-cache/ https://addons.mozilla.org/en-GB/firefox/addon/local-cache/