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since update yesterday Firefox no longer functions properly
Hulu videos no longer work. All my log-ins are erased immediately. Downloads very slow. Adobe acrobat doesn't download the entire download.
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V55 has been giving users problems. Reinstall v54.
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/