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  1. mozilla.org
    https://support.mozilla.org/en-US/kb/install-older-version-of-firefox

    Install an older version of Firefox | Firefox Help - Mozilla Support

  2. mozilla.org
    https://support.mozilla.org/en-US/kb/Installing a previous version of Firef…

    Installing a previous version of Firefox | Mozilla Support

  3. mozilla.org
    https://support.mozilla.org/en-US/questions/1172565

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

  4. mozilla.org
    https://support.mozilla.org/en-US/questions/926025

    where can I download old version of Firefox (needed for support …

  5. superuser.com
    https://superuser.com/questions/1643618

    How do I revert Firefox to a previous version and keep my profile ...

  6. mozilla.org
    https://support.mozilla.org/ja/kb/install-older-version-of-firefox

    以前のバージョンの Firefox をインストールするには | Firefox ヘ …

  7. mozilla.org
    https://support.mozilla.org/en-US/questions/1171502?mobile=1

    Download old version of Firefox | Firefox Support Forum - Mozilla …

  8. mozilla.org
    https://support.mozilla.org/en-US/questions/1184977

    How can I get my old Firefox browser back? - Mozilla Support

  9. mozilla.org
    https://support.mozilla.org/en-US/kb/recovering-important-data-from-an …

    Recover important data from an old profile | Firefox Help - Mozilla …

  10. mozilla.org
    https://support.mozilla.org/en-US/questions/1186624

    Restore previous version | Firefox Support Forum - Mozilla Support