I have an html-file with several d3-graphs directly written in script tags into it. When I outsource one of the graphs into an external js file I get this message "NS_ERROR_DOM_BAD_URI: Access to restricted URI denied". If I delete the code with d3.json where it reads a local json file the error disappears. But it has to be possible to load a json file in an external js which is embedded into an html, right? d3.json("forcetree.json", function(json) { root = json; update(); });