This is a cool add on, thought I would pass it on.
Cooliris Previews 2.0 for Firefox gives you the power to browse faster and send links instantly.
" Simply mouse over the Cooliris link icon, and a preview window will instantly appear to show you the underlying content. No more clicking back and both, or leaving your current page.
" To email a link instantly, just right-click on any web page.
" Right-click on any phrase to have Cooliris automatically do a subsearch in Google, Wikipedia, or a dictionary.
" Customize how and when you want the preview window to appear. (See our developer notes below)
Cooliris Previews 2.0 does not contain any adware or spyware whatsoever.
https://addons.mozilla.org/firefox/2207/