Starting with Firefox version 49, Firefox requires Mac OS X 10.9 (Mavericks) or higher. Visit this Apple Support page to find your Mac OS version.

If you're using an outdated version of Firefox on Mac OS X 10.8 (Mountain Lion) or earlier, the only way you can update Firefox to a secure version is to upgrade your Mac OS to a version that Apple supports. Visit this Apple Support page to learn more about upgrading your Mac.

From the outside, the Lion looks a lot like a 100 Grand: chocolate-coated puffed rice cereal with some caramel for good measure. But cutting through all the way, we found a pleasant surprise: a wafer cookie! Turns out the Lion bar is a lot like a cross between that 100 Grand bar and a Kit-Kat. Browsers & Mobile Devices for Live Testing. Increase the coverage of your cross browser testing with instant access to 2000+ desktop browsers and real mobile devices. If you're wondering why cross browser testing is important or how to build a test strategy, read this guide. Firefox, Safari and Chrome. HTML 5 and CSS3. Intensive use of the CSS3 Keyframes Animations and:target pseudo-class and for GUI. Clock, Fake Login and add special classes after login to remove animations and fix the desktop, hide and show window and and added classes for the dock. Draggable Window. Use a jQuery UI Draggable plugin.

Firefox Mac Os 10.7 Lion

While insecure versions of Firefox will continue to work on OS X 10.8 and earlier, using an up-to-date version of Firefox on a supported version of Mac OS will provide you with the best and safest user experience.