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Install an older version of Firefox | Firefox Help - Mozilla Support
Installing a previous version of Firefox | Mozilla Support
Where can I get an earlier version of Firefox (V51 or earlier)?
where can I download old version of Firefox (needed for support …
How do I revert Firefox to a previous version and keep my profile ...
以前のバージョンの Firefox をインストールするには | Firefox ヘ …
Download old version of Firefox | Firefox Support Forum - Mozilla …
How can I get my old Firefox browser back? - Mozilla Support
Recover important data from an old profile | Firefox Help - Mozilla …
Restore previous version | Firefox Support Forum - Mozilla Support