Everyone who uses a Chromium based browser needs to try this: https://github.com/deepjyoti30/startpage
EDIT: #firefox as well, apparently.
It's a highly customizable "new tab" that is installed by git cloning the repository and then unpacking the extension manually, which is exactly what you want for something like this; that way, everything is run 100% locally, and nothing phones home.
I just got done setting it up with all of my browser profiles, to give them each a unique name for the new tab, so that Qtile has individual window titles to match against rules, so that I can just autostart all of them at once and have them all sorted into their respective workspaces (you can't get me to call them "groups," lol) without having to touch anything.
It's the little things; it really is.