The most restrictive license in both Firefox and Chromium is LGPL. In Firefox, the LGPL bits are carefully walled off in one .so/.dylib/.dll. In Chromium, the m

The most restrictive license in both Firefox and Chromium is LGPL. In Firefox, the LGPL bits are carefully walled off in one .so/.dylib/.dll. In Chromium, the most core KHTML bits are LGPL. As for whether there's a lot of MPL or a lot of BSD code probably doesn't have much practical effect for compliance. In order to comply, it's easier to publish all the code than to try to do the minimum for each component on a per-license basis.