Mozilla Release Beta 3 of Firefox 3.6 late Tuesday afternoon. This release includes some 90+ bug fixes, here a few: A new API will now allow add-on developers access Firefox’s geolocation features. (See Doug Turner’s post) As expected,  tab previews on Windows 7 taskbar has been pulled back. This is a real disappointment: there will be no support at all for some of Windows 7’s most welcomed features: jump lists, download progress in the task bar (a la IE8), and now no tab previews. In the security/stability front, the Firefox components directory is now locked down, which means no third…