On Firefox for Keyboarders:

Fast Tab Switcher little used but absolute best Firefox extension for navigating tabs. It shows all tabs for all windows in one drop down accessible by a keyboard shortcut (I use ctrl-q in windows) Tabs are filtered as you type.Tabs can be quickly closed by ctrl-del in drop-down. https://addons.mozilla.org/en-US/firefox/addon/fast-tab-swit...

Vimium-FF Must have for keyboard navigation. Hit escape key and every link on page is navigable by a key sequence. https://addons.mozilla.org/en-US/firefox/addon/vimium-ff/

Web Search Navigator.

Easy keyboard navigation of search results. https://addons.mozilla.org/en-US/firefox/addon/web-search-na...