Firefox version 78 is 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. These users will be moved to the Firefox Extended Support Release (ESR) channel by an application update. This will provide security updates until the next ESR update in July 2021, after which the affected users will no longer receive security updates.
Mac users interested in Firefox for os x 10.5.8 generally download: Firefox 80.0 Free Firefox is one of the most popular web browsers on the market, providing numerous helpful features and quick speed to millions of users worldwide. Download Mozilla Firefox Beta for Mac to experience cutting-edge browser features and contribute to putting the final tweaks on performance and functionality. Mozilla Firefox Beta has had 30.
While Apple does not have a public policy governing security updates for older OS X releases, their ongoing practice has been to support the most recent three releases. The last security update applicable to OS X 10.11 was made available in July 2018. 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.
Up until July 2021, we will be updating affected users with critical security updates through the Firefox ESR channel to help retain the best possible security. After this, no security updates will be provided.
If you want to keep your Firefox version up to date, you will need to upgrade your operating system to macOS 10.12 or higher. Older versions that are not supported by Apple are unreliable and unsafe to use, which also makes it difficult to maintain Firefox on those versions.
According to Google Chrome browser page, the present Chrome version is said
to support Mac OS X 10.9.5 to present 10.11.5. Chrome Browser - Google
However, the issues and problems that Chrome continues to show Mac users,
indicate that it is not a wise choice for Macs. Users have found Chrome to be
a resource hog, that affects all OS X performance.
A better browser may be found in Mozilla Firefox; also Safari is still supported by
Apple at present (my OS X 10.9.5 has recent version Safari; I prefer Firefox.)
Firefox For Mac 10.9.5
• How to Download and Install Firefox on Mac - Mozilla Firefox Help:
Also browser such as SeaMonkey (Mozilla) has email client with browser for 10.9.5.
Firefox Download For Mac 10.5.8
A few others are likely OK, that won't cost you performance elsewhere.
Good luck & happy computing! 🙂
Jun 8, 2016 5:08 PM