Unsupported operating systems do not receive security updates, have known exploits, and can be dangerous to use, which makes it difficult to maintain Firefox on those versions.” Windows, Mac, and Linuxįirefox 78 also brings a few developer features, including a new regex engine, updates to the ECMAScript Intl API, new CSS selectors, enhanced support for WebAssembly, and Firefox Developer Tools improvements. “The last security update applicable to macOS 10.11 was made available in July 2018. “While Apple does not have a public policy governing security updates for older macOS releases, their ongoing practice has been to support the most recent three releases,” Mozilla says in a support article. Unsurprisingly, Mozilla recommends that Mac users on these old versions upgrade their operating system. These users will be automatically moved to Firefox ESR. In other words, if you’re using Firefox ESR, you’ll now get Firefox 78 and be stuck with it until July 2021.Īt the same time, Mozilla is dropping Firefox support for OS X 10.9 Mavericks, OS X 10.10 Yosemite, and OS X 10.11 El Capitan. Firefox ESRs are maintained for one year. Firefox 78 is a Firefox Extended Support Release (ESR), designed for schools, universities, businesses, and others who need help with mass deployments.
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