Mooz has made xkeysnail which can do some of the same things, anywhere in X.
There's also a menagerie of Vimperator alikes for Firefox: Tridactyl, Vim Vixen, Surfingkeys, Vimium-FF, VVVimpulation. Most of them have improved substantially since September 2017.
Yes, I know. I'm using xkeysnail on Linux for C-n, C-p and C-m keybindings which I haven't seem to make it work in cVim. And for Windows, AHK for the same functionality.
There's also a menagerie of Vimperator alikes for Firefox: Tridactyl, Vim Vixen, Surfingkeys, Vimium-FF, VVVimpulation. Most of them have improved substantially since September 2017.
Disclaimer: lots of Tridactyl's jank is my fault.