I guess it's a security feature. True, it can avoid getting MITM'ed, or DNS hi-jacked, for downloads, but there are other ways around that, such as application-signing on Windows.
Mozilla Firefox® Portable Edition Nightly Builds are pre-alpha/alpha quality builds of the popular Mozilla Firefox web browser bundled with a PortableApps.com launcher as a portable app, so you can take your browser, bookmarks and passwords with you. These builds are intended for testing...
portableapps.com
On the other hand, Chrome 86 will give me a warning.
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