I've try to create an extension that add params to url, but not work!! In Chrome Extension details give me error Uncaught SyntaxError: Unexpected token ':' Can you help me please?

{
   "background": {
      "persistent": true,
      "scripts": [ "backgroundscript.js" ]
   },
   "description": "MY EXTENSION",
   "manifest_version": 2,
   "name": "MY EXTENSION",
   "permissions": [ "webRequest", "webRequestBlocking", "*://www.mysite.com/*" ],
   "version": "1.0"
}

chrome.webRequest.onBeforeRequest.addListener(
    function(details) {
        return {
            redirectUrl: details.url + 
                (details.url.indexOf("?") == -1 ? "?" : "") +
                (details.url.indexOf("&param=XXX") == -1 ? ("&param=XXX" : "")
        };
    },
    {urls: ['*://*.mysite.com/*'], types: ['main_frame']},
    ['blocking']
);