ダウンロードしたFirefoxが公式のものか確認したい

Hi, that file sounds like the "stub" installer. If it's the official one, it checks your system and then downloads the full installer suited to your OS.

You might prefer to download the full installer yourself. Those are available through:

https://www.firefox.com/download/all/desktop-release/

Thank you for your response. How can I know that it is official?

Hi, are you looking for a checksum? I'm not sure where to find those.

If you download directly from the build archive, there are checksum files there, but tracking down all the bits and pieces looks to be a bit of a chore:

https://archive.mozilla.org/pub/firefox/releases/159.0/

Is it possible to attach the file I downloaded? I am so glad if you check the file.

I have the file link I downloaded. But it seems like I cannnot send the file link according to rules and guidelines. Is there other ways to check it is the official? If I check signer name of the file, is it possible to know that it is the official?

I found website URL I downloaded form my search history, Is it possible to use it to check if it is the official?

I can share the URLs I see when I try the download from

https://www.firefox.com/en-US/

and click the "Try Firefox" button:

(1) https://download.mozilla.org/?product=firefox-stub&os=win&lang=en-US

That URL redirects to a different server:

(2) https://download-installer.cdn.mozilla.net/pub/firefox/releases/159.0/win32/en-US/Firefox%20Installer.exe

This is for the en-US locale, so your paths may have your locale in place of en-US.

Thank you! I think I downloaded from https://www.firefox.com/ja/download/windows/

Is it the offical one?

Thank you! I think I downloaded from https://www.firefox.com/ja/download/windows/ Is it the offical one?

Yes, that is an official Mozilla page.

Thank you! I might download from the URL I sent you. I hope the one I downloaded is the official one.