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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:

Firefox For Mac G5 Download Nov 29, 2011 System Requirements: Firefox 4 Firefox 5 Firefox 6 Firefox 7 Firefox 8 The good news is that Firefox 3.6.24 still supports OSX 10.4 and Macs with the PPC Mac architecture.

Choose which Firefox Browser to download in your language Everyone deserves access to the internet — your language should never be a barrier. That’s why — with the help of dedicated volunteers around the world — we make the Firefox Browser available in more than 90 languages.
We don't have any change log information yet for version 88.0.1 of Mozilla Firefox for Mac. Sometimes publishers take a little while to make this information available, so please check back in a few days to see if it has been updated.
Download Firefox 88.0.1 for Mac for free, without any viruses, from Uptodown. Try the latest version of Firefox 2021 for Mac.

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 Such software may not be essential for your security but, if outdated, may interfere with the use of Firefox or cause Firefox to crash.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)
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Important: 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.

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. Mazatrol programming software, free download. 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.

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Version 52.9.0 for Windows, English
92MB download / 194MB installed
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Mozilla Firefox, Portable Edition Legacy 52 can run from a cloud folder, external drive, or local folder without installing into Windows. It's even better with the PortableApps.com Platform for easy installs and automatic updates.

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Mozilla Firefox® Portable Edition Legacy 52 is the final release of the 52.x branch of the Extended Support Release of the Mozilla Firefox web browser bundled with a PortableApps.com launcher as a portable app, so you can take your browser, bookmarks and passwords with you. It is intended for groups who deploy and maintain the desktop environment in large organizations such as universities and other schools, county or city governments and businesses and the developers who support them. Individual users should use standard Mozilla Firefox,

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