Note that you shouldn't disable 'Allow pages to choose their own fonts, instead of your selections above' as this will cause issues with iconic fonts used by webpages to display small icons (you may see text labels instead of icons). You can check in Font Book for font issues like corrupted and duplicate fonts.

You may find that it can be resolved by finding and removing duplicate fonts installed in the local ~/Library/Fonts folder, that are conflicting with standard system fonts. They are unreliable and unsafe to use, which also makes it difficult to maintain Firefox on those versions.This is usually caused by a problem with a specific font and you need to identify this font and fix this.

If you want to keep your Firefox version up to date, you need to upgrade your operating system to macOS 10.12 or higher. How can I get the newest features of Firefox? After this, no security updates will be provided. Up until October 2021, we were updating affected users with critical security updates through the Firefox ESR channel, to help retain the best possible security. 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.Ĭan I still browse safely with Firefox on OS X 10.9, 10.10 or 10.11? Apple made the last security update applicable to OS X 10.11 available in July 2018. Why has Firefox ended support for OS X 10.9, 10.10 and 10.11 users?Īlthough Apple does not have a public policy governing security updates for older OS X releases, its practice is to support the most recent three releases. Affected users will not receive any further security updates. This was done to provide security updates until the final Firefox 78 ESR update (version 78.15.0esr) was released on October 5, 2021. These users were moved to the Firefox Extended Support Release (ESR) channel by an application update.

Firefox Mac OS X 10.9, 10.10 and 10.11 users move to Extended Support Releaseįirefox version 78 was the last supported Firefox version for Mac users of OS X 10.9 Mavericks, OS X 10.10 Yosemite and OS X 10.11 El Capitan.

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