StumbleUpon for Non-Supported Browsers like Opera and Safari
StumbleUpon is a great way to explore interesting web pages, videos and killing spare time, but unfortunately their toolbar supports Firefox and Internet Explorer only. Digital Inspiration writes a super quick workaround, which allows any unsupported browser like Safari or Opera to use StumbleUpon without installing their toolbar.
Just visit http://www.stumbleupon.com/demo/#url=http://google.com and you’ll notice a web-based version of StumbleUpon’s toolbar hovering over the page. No installation required.

This trick is basically meant to give users a preview of what StumbleUpon has to offer before installing their toolbar. Some features like giving thumbs up or down are curbed in this demo version, but you can still stumble for web content and share interesting stuff with your friends via email.
If you are someone, who hates installing a lot of toolbars on your browser, then this one is for you as well!