Do they have to be GPL or can they be something else? And if nothing is specified in the code are they considered to be GPL by default?
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I’m not a lawyer, so take this with a grain of salt.
First off, Mozilla has nothing to do this. There is no reason to believe that Firefox add-ons are GPL-licensed by default. That’s because the license of the browser doesn’t affect the license of the add-ons; they don’t typically reuse the browser’s source code. (In fact, Firefox itself isn’t necessarily GPL’d. Mozilla releases it under a tri-license which includes the Mozilla Public License as one of the license options.)
So, I’d imagine that if you don’t specify a license to an add-on, then that add-on defaults to whatever copyright control would be extended to you as author of the add-on, depending on your jurisdiction.
Now if you used GPL’d code in your add-on, then that add-on would obviously be GPL-licensed if you released it publicly. Unless you got special permission from the original author to use a different license, of course.