If you just want to use your web browser more efficiently, from the keyboard, you don't need addons like Vimperator or VimFX. Firefox already has keyboard shortcuts for everything. You can press Alt+H K to see the list of keyboard shortcuts.

You can press Ctrl+L to select the location bar, Ctrl+K to select the search bar. You can set browser.search.openintab if you want searches from the search bar to open in a new tab and keyword.enabled to false if you don't want the location bar to be used for searches.

You can press / and type text to select any text with the Quick Find bar,[1] or press ' to select only links. You can use Ctrl+G or F3 in the Quick Find bar to go to the next occurrence of your search and Shift+Ctrl+G or Shift+F3 to go to the previous occurrence.

You can use smart bookmarks to go quickly to any website or make searches on any website by putting %s in a bookmark URL and adding a keyword which can be used from the address bar.[2] You can even add keywords that will do POST requests with the 'Add a Keyword for this Search...' context menu item for search fields.[3]

There are also many keyboard shortcuts for editing and selecting text in text fields, which have the benefit of being the same in most applications on all platforms. There's a list on Wikipedia.[4]

There are keyboard shortcuts even for the more obscure features, like Ctrl+Alt+R to enable reader mode and Ctrl+M to mute or unmute the current tab.

Your web browser already has good keyboard shortcuts, you just need to learn them.

[1]: https://support.mozilla.org/en-US/kb/search-contents-current...

[2]: http://kb.mozillazine.org/Bookmark_Keywords

[3]: https://support.mozilla.org/en-US/kb/how-search-from-address...

[4]: https://en.wikipedia.org/wiki/Table_of_keyboard_shortcuts#Te...