Google & Youtube NCR for Google Chrome

background.js

// .com and .sa to US
var google = "http://www.google.com",
	googleus = encodeURI("?gl=us&hl=en&pws=0&gws_rd=cr");

chrome.webRequest.onBeforeRequest.addListener(
    function(details) {
	    return {redirectUrl: google + details.url.match(/^https?:\/\/[^\/]+([\S\s]*)/)[1] + googleus};
    },

    {
        urls: [
            "*://www.google.com/",
            "*://www.google.com.sa/",
        ],
        types: ["main_frame", "sub_frame", "stylesheet", "script", "image", "object", "xmlhttprequest", "other"]
    },
    ["blocking"]
);

// youtube.com to US
var youtube = "http://www.youtube.com",
	youtubeus = encodeURI("?gl=US");

chrome.webRequest.onBeforeRequest.addListener(
    function(details) {
	    return {redirectUrl: youtube + details.url.match(/^https?:\/\/[^\/]+([\S\s]*)/)[1] + youtubeus};

    },

    {
        urls: [
            "*://www.youtube.com/",
        ],
        types: ["main_frame"]
    },
    ["blocking"]
);

/* google SA omni to US
var	googleomni = encodeURI("&gl=us&hl=en&pws=0");

chrome.webRequest.onBeforeRequest.addListener(
  function (details) {
  		var requestURL = details.url,

    	re = new RegExp('^(http(?:s)?):\/\/www\.google\.(?:(?!com\/)[a-z]+\.?[a-z]+)', 'i'),
        finalurl = requestURL.replace(re, '$1://www.google.com');

    if (details.url.indexOf(googleomni) > -1) {
        return {
            redirectUrl: finalurl
        };
    } else {
        return {
            redirectUrl: finalurl + googleomni
        };
    }
  },
{
    urls: [
        "*://www.google.com.sa/",
    ],
    types: ["main_frame"]
},
  ['blocking']
); */

// google.com omni to US
var	googleomni = encodeURI("&gl=us&hl=en&pws=0");

chrome.webRequest.onBeforeRequest.addListener(
  function (details) {
  	var requestURL = details.url;

    if (details.url.indexOf(googleomni) > -1) {
        return {
            redirectUrl: requestURL
        };
    } else {
        return {
            redirectUrl: requestURL + googleomni
        };
    }
    
  },
{
    urls: [
        "*://www.google.com/search?*",
    ],
    types: ["main_frame"]
},
  ['blocking']
);


// google.com hp to US
var	googlesahp = encodeURI("&sa=X" );

chrome.webRequest.onBeforeRequest.addListener(
  function (details) {
	  	var requestURL = details.url;

        if (details.url.indexOf(googlesahp) > -1) {
            return {
                redirectUrl: details.url.replace(googlesahp, encodeURI("&gl=us") )
            };
        }
    },
{
    urls: [
        "*://www.google.com/webhp*",
    ],
    types: ["main_frame"]
},
  ['blocking']
);


// google images hp to US
var	googleimages = encodeURI("?gl=us&hl=en");

chrome.webRequest.onBeforeRequest.addListener(
  function (details) {
  	var requestURL = details.url;

    if (details.url.indexOf(encodeURI("?gl=us&hl=en")) > -1) {
        return {
            redirectUrl: requestURL
        };
    } else {
        return {
            redirectUrl: details.url.replace(encodeURI("?hl=en"), googleimages)
        };
    }
    
  },
{
    urls: [
        "*://www.google.com/imghp*",
    ],
    types: ["main_frame"]
},
  ['blocking']
);