file is being assigned a //# sourceMappingURL but already has one

Question

I just notice Firefox console outputs the following error for every single .js/.coffee file in my project (even the packages).

-file- is being assigned a //# sourceMappingURL, but already has one 

Chrome's console doesn't show anything. I tried deleting all the .map files and clearing Firefox's cache but I'm still getting the errors.

Answer 1

It's a warning (not an error) and it is a bug (https://bugzilla.mozilla.org/show_bug.cgi?id=1020846 fixed in FF 33)

This warning/error also applies to other libs (angular, backbone, etc.)