Tridactyl is a must for me. It’s as close to the Qutebrowser experience as I can find (especially with ‘:guiset none’) but I get to keep my ublock/sponsorblocks.
What is Tridactyl?
Tridactyl is an extension for Firefox which replaces its default control mechanism with one modelled on the one true editor, Vim.
Much more information is available on our GitHub page and on the Firefox Add-ons page.