How to Implement Vim Motions (Like Vimium) in Zen-Browser?

[Nicknamely]

I'm interested in adding Vim-like motion controls (similar to Vimium) to Zen-Browser. To start, I was thinking of implementing a leader key to access additional keybinds.

I've never done anything like this before or anything close to it, so I'm looking for guidance on where to start.

Here are my goals for the feature:

• Implement a leader key, similar to how it's used in most Neovim configs.
• Enable access to everything in the browser through keybindings.
• Complement Vimium for web browsing instead of reinventing the wheel—just tweaking and extending its functionality where needed.