Desktop pretty much uses the [URIFixup module (https://searchfox.org/mozilla-central/rev/ee2ad260c25310a9fbf96031de05bbc0e94394cc/docshell/base/URIFixup.sys.mjs), that for the most part trusts the URI parser, in the sense in most cases it will put a protocol in front of the string and see if it resolves to a valid URI. It also does some typo correction for common protocols, or public suffixes. Flags can be used to adapt behavior.
Bug 1877530 Comment 13 Edit History
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Desktop pretty much uses the [URIFixup module] (https://searchfox.org/mozilla-central/rev/ee2ad260c25310a9fbf96031de05bbc0e94394cc/docshell/base/URIFixup.sys.mjs), that for the most part trusts the URI parser, in the sense in most cases it will put a protocol in front of the string and see if it resolves to a valid URI. It also does some typo correction for common protocols, or public suffixes. Flags can be used to adapt behavior.
Desktop pretty much uses the [URIFixup module](https://searchfox.org/mozilla-central/rev/ee2ad260c25310a9fbf96031de05bbc0e94394cc/docshell/base/URIFixup.sys.mjs), that for the most part trusts the URI parser, in the sense in most cases it will put a protocol in front of the string and see if it resolves to a valid URI. It also does some typo correction for common protocols, or public suffixes. Flags can be used to adapt behavior.