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Want to upgrade but don't know anything about this computer

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I don't understand anything about computers so I'm not sure what model or make they're asking me to choose so I can upgrade.

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Installing Firefox on Mac

https://support.mozilla.com/en-US/kb/Installing%20Firefox%20on%20Mac

Check and tell if its working.

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That's an old Mac, which won't run much newer versions of Firefox than you already have. Firefox 2.0.0.20 is the last ever release for Mac OSX 10.3.9 and earlier versions.
Get it here:
https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/mac/en-US/