The new OS from Mac is here in OS X El Capitan. Apple's 12th OS release is the OS X El Capitan.Named after a rock formation in the Yosemite National Park, USA, OS X El Capitan continues and focuses on stability, performance and security in which OS X Yosemite started. Highlighted items will not be available on Mac OS X 10.11 (El Capitan). Legacy issue in Safari versions 7.0 to 9.0 You are unable to upload an entire folder via drag and drop.
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If you're using an outdated version of Firefox on Mac OS X 10.8 (Mountain Lion) or earlier, the only way you can update Firefox to a secure version is to upgrade your Mac OS to a version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.
Download Internet Explorer For Mac Os X El Capitan Release Date
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.