The "tabs" feature is really really really cool!!! quote from the great site "macosxhints.com": To create a tab, simply hit control-T (not command-T!). Once created, click on a tab to activate it. Switching among the tabbed pages is nearly instantaneous. You can even switch tabs while loading a page in one tab; Mozilla treats each tab as an independent window, so that multiple tabs can all be loading simultaneously. To delete a tab, simply close the window it's displaying (using the "X" at the right edge of the row of tabs). This functionality in Mozilla is a small subset of a third-party product called MultiZilla, which has many additional features. It should be possible to get this running on Mozilla on OS X, but I haven't tried as of yet. To try out tabbed browsing, you'll need to get the latest nightly build for OS X, as tabs are NOT in the latest milestone (0.94) release.