Yes, all the parts that are MPL licensed (the vast majority of the browser, minus their frontend) need to have their source code released. As far as I can tell,

Yes, all the parts that are MPL licensed (the vast majority of the browser, minus their frontend) need to have their source code released. As far as I can tell, they are currently violating the license. EDIT: Found the source code release here, so they are fine: https://polybrowser.com/faqs/where-can-i-download-the-source-code-for-polybrowser https://polybrowser.com/faqs/where-can-i-download-the-source...