Firefox

Change default search engine for address bar

http://www.firefoxfacts.com/2008/01/13/change-default-search-in-firefox/

In your address bar, type in: “about:config”

Inside of the filter search box, type in:

browser.search.defaultenginename

It's all text

https://addons.mozilla.org/en-US/firefox/addon/its-all-text/

Vimperator

http://vimperator.org/vimperator

Use to disable all keybindings.

To map x to close a tab:

:map x :bd

Add it to .vimperatorrc.