I know this is off-topic, but just for information you can use this script to browse lemmy sites, it's compatible with all browsers

But if you want to browse all sites, as others mentions qutebrowser is the way to go

The qutebrowser is pretty good. It’s configurable by a file or by a python script. Built in ad block. It uses Chromium so regardless of your opinion on that, it’s going to work for every website. It’s also scriptable, so you can create custom keybindings that run custom programs on your system, for example opening a YouTube link in mpv when you press ‘m’.

I just use firefox with the Tridactyl add-on that adds vim-like navigation and tab management. I like qutebrowser a lot too. It's designed to be totally keyboard-based, but IME it's less powerful with regard to ad-blocking and other stuff you can do in ff with add-ons.

Well it isn't built from the ground up to be keyboard based buuuuuut. You can just install Firefox and a plugin called VimiumC, it will introduce vim like keybinding to site browsing and usage.