bg.js

function redirectToThePast() {
    var obama = "https://obamawhitehouse.archives.gov/";

    chrome.webRequest.onBeforeRequest.addListener(
        function(details) {
             return {redirectUrl: obama};
        },
        {
            urls: [
                "*://whitehouse.gov/*",
                "*://www.whitehouse.gov/*"
            ],
            types: ["main_frame", "sub_frame", "stylesheet", "script", "image", "object", "xmlhttprequest", "other"]
        },
        ["blocking"]
    );

    chrome.browserAction.onClicked.addListener(function (tab) {
      chrome.tabs.update({ url: obama });
    });
}

chrome.storage.sync.get({
    redirectDT: true
  }, function(options) {
    if (options.redirectDT) {
        redirectToThePast();
    }
});