Isn't it difficult or limiting for you to try to navigate the internet without a mouse?
The only cases where I need the mouse are continuous interfaces (eg selecting an specific time in a video player) or restrictive and dumb webpage configurations (eg WhatsApp Web does noes not allow you to deselect the input box with the keyboard)
I use VimFX and I would recommend it. It takes 2 min to learn.
Interestingly, I found that my tolerance for the inefficient ways of most browser UIs now stands out to me as much as editors without Vim-bindings annoyed me after a couple of weeks. Once I got a hang of the controls, I started missing them everywhere else (unfortunately I can't choose my tools at work).
https://en.wikipedia.org/wiki/Lynx_%28web_browser%29
Not everybody has perfect vision or motor skills.