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Firefox Version 52 Mac Download. Download the beta for the new Firefox 57 Quantum now In Firefox's relentless battle to take on the impregnable Chrome.

The 64 bit version of Firefox has never supported NPAPI, and Firefox version 52ESR is the last release to support the technology. It is below the security baseline, and no longer supported. Java applications are offered through web browsers as either a Java Webstart application (which do not interact with the browser once they are launched).
Download the latest version of Firefox for Mac. A multi-platform web browser with open source code. Mozilla continues to work on further improvements for its.
To Uninstall Firefox: Click Go and select Applications from the drop-down list; From the Applications folder, find the Firefox application, click on firefox.app and drag it to the Trash on your Dock; To Install Firefox on your computer: Click the download link for Mac to get Firefox Version 52.8.0 ESR here.
Download Mozilla Firefox, a free web browser. Firefox is created by a global not-for-profit dedicated to putting individuals in control online. Get Firefox for Windows, macOS, Linux, Android and iOS today!

Warning: Firefox now includes downgrade protection to prevent corruption of user profile data. If you install an older version, you'll be prompted to create a new Firefox profile.

If there is a problem with a new version of Firefox, some people may want to downgrade Firefox to a previous version but we do not recommend this. The latest Firefox version includes security updates so downgrading to an older version leaves you more vulnerable to attacks and usually doesn't fix the problem. This article gives you some alternatives to downgrading and links to older versions of Firefox if you do choose to downgrade.

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Problems with an update are usually not caused by the new version of Firefox, but rather the update process. In most cases, installing a previous version will not help. Instead, see:

Note: Other problems can be solved with the Refresh Firefox feature. It restores Firefox to its default state while saving your essential information.

Ensure all security and security-related software is fully updated. Some security software will need to be upgraded to a new version so that it is compatible with each Firefox version update.

Optional software bundled with security software also may need updating. Such software may not be essential for your security but, if outdated, may interfere with the use of Firefox or cause Firefox to crash.

If you still want to downgrade, you can visit Mozilla's directory of older Firefox versions using the links below. Please note, however, that using older versions can make Firefox insecure and more vulnerable to attacks and scams. We recommend that you always use the newest version of Firefox.

Warning: Old Firefox versions pose a significant security risk.

Firefox 77.0.132-bit (US English)
Firefox 77.0.164-bit (US English)

Firefox 77.0.132-bit (US English)
Firefox 77.0.164-bit (US English)

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Firefox 78.0.232-bit (US English)
Firefox 78.0.264-bit (US English)

Firefox 78.0.232-bit (US English)
Firefox 78.0.264-bit (US English)

Firefox 79.032-bit (US English)
Firefox 79.064-bit (US English)

Firefox 79.032-bit (US English)
Firefox 79.064-bit (US English)

Firefox 80.0.132-bit (US English)
Firefox 80.0.164-bit (US English)

Firefox 80.0.132-bit (US English)
Firefox 80.0.164-bit (US English)

Firefox 81.0.232-bit (US English)
Firefox 81.0.264-bit (US English)

Firefox 81.0.232-bit (US English)
Firefox 81.0.264-bit (US English)

Firefox 82.0.332-bit (US English)
Firefox 82.0.364-bit (US English)

Firefox 82.0.332-bit (US English)
Firefox 82.0.364-bit (US English)

Firefox 83.032-bit (US English)
Firefox 83.064-bit (US English)

Firefox 83.032-bit (US English)
Firefox 83.064-bit (US English)

Firefox 84.0.232-bit (US English)
Firefox 84.0.264-bit (US English)

Firefox 84.0.232-bit (US English)
Firefox 84.0.264-bit (US English)

Firefox 85.0.232-bit (US English)
Firefox 85.0.264-bit (US English)

Firefox 85.0.232-bit (US English)
Firefox 85.0.264-bit (US English)

Firefox 86.0.132-bit (US English)
Firefox 86.0.164-bit (US English)

Firefox 86.0.132-bit (US English)
Firefox 86.0.164-bit (US English)

Firefox 87.032-bit (US English)
Firefox 87.064-bit (US English)

Firefox 87.032-bit (US English)
Firefox 87.064-bit (US English)

Important Mac

: By default, Firefox is set for automatic updates. To prevent Firefox from automatically updating itself after you install an older version, you'll need to change your Firefox update settings:

In the Menu bar at the top of the screen, click Firefox and select Preferences.Click the menu button and select .Click the menu button and select .

In the General panel, go to the Firefox Updates section.

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Instead of downgrading to an older, insecure version of Firefox and changing your update settings, you should consider these alternatives:

Install Firefox Extended Support Release.Firefox Extended Support Release (ESR) is an official version of Firefox developed for large organizations such as universities and businesses. Firefox ESR does not come with the latest features, but it does have the latest security and stability fixes. For more information, see the article Switch to Firefox Extended Support Release (ESR) for personal use.

Use the latest version of another browser. If you are not satisfied with the current Firefox version or it simply is not working right now, there are alternative browsers that you can use to browse the web.

Firefox Legacy

Firefox Legacy is an unofficial modified version of Mozilla Firefox that works on older Mac OS X versions, including 10.6 Snow Leopard, 10.7 Lion, and 10.8 Mountain Lion.

Download it now and breathe new life into your old Mac.

OS X 10.8 Mountain Lion

Current version for OS X 10.8 Mountain Lion: 71.0p2 (2020-09-15)
IMPORTANT NOTE ABOUT UPDATING TO v71: A new Firefox profile will be created when you update from earlier versions to version 71.0. To restore your previous data, type 'about:profiles' in the address bar, then find your previous profile (if you can't tell which, try each one) and set it as default. Then, restart Firefox Legacy. I apologize for the inconvenience; the cause of this issue is not known.

OS X 10.7 Lion