Yes, it's possible, I converted and made so many webpages viewed in 3D using Mozilla Firefox. May be it's one reason the browser remains World's most popular web browser.
The Firefox 17.0.1, which was the latest version as at the time I published this post comes with some many features yet to be unlocked.
I was less busy when I stumbled upon this, it's something you can do For Fun.
FOLLOW THESE STEPS:
* Right Click on the Website/website you want to convert and View in 3D
* Click on Inspect Element (Q)
* The page element bar is shown at the foot of the screen
* Click 3D view, and there! You have the webpage converted and displayed in 3D.
Check out my Google Plus homepage, after changing it to 3D!
Hope you like it?
Please Share the Fun!!!