Yeah, but IceCat is not the same as IceWeasel (it has different patches), so it makes sense for them to have different names.
Mozilla lets you use Firefox if you don't change the source; I believe Fedora and other distros release it with the original name. The difference is that, unlike Debian, they don't apply patches to the upstream source in their builds.
And I find it hard to believe that Google allows you to use the Chromium mark if you release a patched build; they're probably no different than Mozilla in that regard.
Mozilla lets you use Firefox if you don't change the source; I believe Fedora and other distros release it with the original name. The difference is that, unlike Debian, they don't apply patches to the upstream source in their builds.
And I find it hard to believe that Google allows you to use the Chromium mark if you release a patched build; they're probably no different than Mozilla in that regard.