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You should only use a domain you own or something that isn't routable. You can't blame FF for that

That was an issue with .dev and then google acquired the TLD.

.dev isn't an rfc2606 reserved TLD, so it shouldn't have been used for internal domains in the first place

Replying to the part about ‘something that isn’t routable’

Not because something is not routable means that there won’t be issues.