"One cannot hang a song, sure, but one can hang a singer". There are not so many places where people can get Firefox or Chromium, even fewer places where they can get source code of the named browsers. [EDIT] grammar

You criminalize the platform where it's published. The laws for that have been conjured in 2018.

The second they do that the entire internet is going to download it to see what the fuss is about.

While they could legally do that, it's going to blow up in their face if they did it. I remember the old crypto export wars in the US and OpenBSD being based in Canada so they could ship string crypto in SSH.

Did you mean strong crpyto? String crypto makes no sense in the context.