If you keep your passwords stored on Apple's iCloud, you can access those passwords on Firefox through an official iCloud Passwords extension, as spotted by MacRumors. However, the extension only supports macOS Sonoma or later, so you won't be able to use it with Windows.
If you do need to access your iCloud passwords on Windows, you can access them by downloading iCloud for Windows and the iCloud Passwords extension for Chrome or Edge instead.
Apple is now the sole owners in charge of maintaining their own official iCloud Passwords extension, according to a notice on the extension's GitHub page.
The extension's repository and source code aren't linked to it anymore except for 'historical reasons.' This indicates a clear transition of responsibility from the original developer to Apple.
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