It works like this: Firefox finds your IP address, gathers information from any nearby Wi-Fi hot spots, and sends that to Google Location Services (its geolocation service provider), which then tries to determine your location and shares that information with the Web site you're visiting. All this happens only if you give Firefox permission; Mozilla claims that it's done in a way that protects your privacy.

Version 3.5 also supports downloadable fonts, and CSS support has been improved. And the "Awesome Bar," which is Firefox's name for the Address Bar, has gotten a slight change that power tweakers will appreciate: You can now more easily filter results as you type text into the bar. So, for example, if you want to see results only from your bookmarks, use the * character (as in Gralla*); if you want results only from tags, use the # character (e.g., Gralla#).

If you're a Firefox user, this upgrade is a no-brainer. Browsing the Web is significantly faster, the ability to re-open previously closed tabs and windows is a major improvement, and as for PrivateBrowsing ... I won't delve into your personal life, but if you've got a need to keep some of your browsing a secret, you'll want this feature.

The video is a nice-to-have, but won't be particularly useful until sites start using it. The same holds true for Location Based Browsing and some of the other improvements.