I've been trying to use the Firefox profiler and no matter what I did it always throws a "SyntaxError: JSON.parse: unexpected non-digit at line 1 column 1018761 of the JSON data" Only errors when I'm trying to profile MY web application, which primarily uses three.js. Couldn't find anything relating to issues with the Firefox profiler online, but I found your comment so here's me going straight to the source.