Neovim
Neovim is a modal text editor forked off of Vim in 2014. Being modal means that you do not simply type text on screen, but the behavior and functionality of the editor changes entirely depending on the mode.
The most common and most used mode, the "normal mode" for Neovim is to essentially turn your keyboard in to hotkeys with which you can navigate and manipulate text. Several modes exist, but two other most common ones are "insert mode" where you type in text directly as if it was a traditional text editor, and "visual mode" where you select text.
Neovim seeks to enable further community participation in its development and to make drastic changes without turning it in to something that is "not Vim". Neovim also seeks to enable embedding the editor within GUI applications.
The Neovim logo by Jason Long is licensed under the Creative Commons Attribution 3.0 Unported License.
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I don't know if it's better because I haven't tried vimium c. I had only heard about vimperator and when I looked it up on firefox add-ons it redirected to tridactyl page. Tridactyl is inspired of pentadactyl which is a fork of vimperator.