Firefox was the first browser to introduce a private browsing feature which allows you to use the internet more anonymously and securely. History, searches, passwords, downloads, cookies and cached content are all removed on shutdown.

Incompatible software is perhaps the biggest reason for not upgrading. Send to kindle for mac crashes. So syncing means nothing to you; in any case syncing is no reason for upgrading to High Sierra or Mojave. As for syncing, Sierra can do that perfectly well; you don’t need to upgrade to get that capability. But you should not feel that you have to upgrade.

Firefox, the award-winning web browser, is now faster, more secure, and fully customizable to your online life. Firefox empowers you to accomplish your online activities faster, more safely and efficiently than any other browser, period. Built with Tab browsing, popup blocking and a number of other seamless innovations, Firefox stands out ahead. The wait is over. Firefox empowers you to browse faster, more safely and more efficiently than with any other browser.