LibreJS is a Firefox add-on that does roughly what you describe. If a piece of Javascript code is not properly annotated with a license (for example in a commen

LibreJS is a Firefox add-on that does roughly what you describe. If a piece of Javascript code is not properly annotated with a license (for example in a comment block at the top) it refuses to execute it. https://www.gnu.org/software/librejs/ https://www.gnu.org/software/librejs/ https://www.gnu.org/software/librejs/free-your-javascript.html https://www.gnu.org/software/librejs/free-your-javascript.ht... It can be a bit fickle. I recently tried to make code comply with it and it didn't initially work because I was using a non-standard version of the ISC license with one different word.