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Where can I get an earlier version of Firefox (V51 or earlier)?

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I have a particular piece of software which will not run on any version of Firefox later than V51. I need to be able to download an earlier version of Firefox (my current install is V55.0.2) Running Windows 10 64 bit

I have a particular piece of software which will not run on any version of Firefox later than V51. I need to be able to download an earlier version of Firefox (my current install is V55.0.2) Running Windows 10 64 bit

Επιλεγμένη λύση

You can install a portable (ESR) Firefox version to access websites that do not work with the current Firefox release. The portable version comes with its own profile folder and doesn't interfere with currently installed Firefox versions.

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https://support.mozilla.org/en-US/kb/install-older-version-of-firefox?cache=no Be sure to read everything here.

If you still want to downgrade, look under; I still want to downgrade. Click the Directory of other versions and languages link. Look for the directory of the version that you want. But, remember that old versions may have security issues.

You should also check out Firefox; Extended Support Release https://www.mozilla.org/en-US/firefox/organizations/

https://www.mozilla.org/en-US/firefox/organizations/notes/

https://www.mozilla.org/en-US/firefox/organizations/system-requirements/

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Επιλεγμένη λύση

You can install a portable (ESR) Firefox version to access websites that do not work with the current Firefox release. The portable version comes with its own profile folder and doesn't interfere with currently installed Firefox versions.