Hotkeys guide for Firefox 4?

Solution 1:

This page is accessible from the help menu in Firefox if you search for "shortcuts".

This is a list of keyboard shortcuts in Mozilla Firefox. If you have enabled Emacs-style text editing shortcuts in GNOME, they will also work in Firefox. When an Emacs text editing shortcut conflicts with the default shortcuts (as occurs with Ctrl+K), the Emacs shortcut will take preference if focus is inside a text box (which would include the location bar and search bar). In such cases you should use the alternate keyboard shortcut if one is listed below.

Firefox does not provide any method of customizing keyboard shortcuts.

Solution 2:

Of course!

Mozilla has a fairly detailed list of documented keyboard shortcuts. Most shortcuts from Firefox 3.x have carried over to Firefox 4.

Personally, I use Ctrl + the tab number to switch between tabs if there aren't very many. To bookmark a page, Ctrl + D is what you want. It works on almost all other browsers as well for the same purpose.