favorite firefox keyboard shortcuts

I've been using Firefox since it was in beta, and it's only recently I've discovered keyboard shortcuts over and above the standard command-L to put the cursor in the URL bar. Given the number of other Firefox users that are surprised when I share the tips, I thought I'd put them up here for all to share:

NOTE: I'm a Mac user, so most of these shortcuts use the Command (aka "Apple") Key in combination with a letter/number. I've shortened the key name to be, simply, Cmd. I assume this equates to "Ctrl" on the PC, but ymmv.

• Cmd+L = puts the cursor in URL bar
• Cmd+K = puts the cursor in the web search box to the right of the URL
  
• bar (defaults to Google Search)
  
• Cmd+T = opens a new tab
  
• Cmd+[number key] = toggles the browser to the tab corresponding to the number pressed (counting left-to-right)
  
• spacebar = page down
  
• shift+spacebar = page up

And a bonus, Apple-only key command that's not limited to Firefox:

Ctrl+Alt+Cmd+8 = reverses the colors on the display (press the key
combo again to toggle back). I find this feature very useful when
using my laptop outdoors when it's really bright and sunny. Makes the
screen much easier to read.

Anyone else got some favorite keyboard shortcuts for Firefox?