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Firefox itself is a web browser and not a website like www.example.com or a homepage.
If you want to know how to set a website as a homepage then see https://support.mozilla.org/en-US/kb/how-to-set-the-home-page
Perhaps an extension changed your homepage from the default about:home https://support.mozilla.org/en-US/kb/extension-changed-my-new-tab-page