// assume http://www.site.com/js/lib.js contains `setInterval('console.log("foo")', 1000)`
var jsCode =__commandLineAPI.getResource('http://www.site.com/js/lib.js');
jsCode = jsCode.replace(/foo/g, 'bar');
__commandLineAPI.getResource('http://www.site.com/js/lib.js', jsCode);
// now we start logging bar without a reload similar to https://remysharp.com/2012/12/21/my-workflow-never-having-to-leave-devtools