A simple Chrome extension that opens random links

background.js

// A background script is needed in order to store
// persistent objects in memory. Content scripts
// run a seperate instance for each open tab in Chrome.

var nextLink = (function(linkArray) {

  // Initialize a copy of the original links
  var currentSet = linkArray.slice();

  return function() {
    var currentLength = currentSet.length;

    // When all of the currentSet links have been used,
    // reinitialize the currentSet array with the initial link array
    if (currentLength === 0) {
      currentSet = linkArray.slice();
    }

    // Pop a random link from the currentSet array
    return currentSet.splice(~~(Math.random() * currentSet.length), 1)[0];
  };

})([
  'https://github.com',
  'http://www.reddit.com',
  'http://stackoverflow.com',
  'https://developer.mozilla.org/en-US'
]);

// Call the nextLink function when the popup icon is clicked
chrome.browserAction.onClicked.addListener(function() {
  chrome.tabs.create({
    url: nextLink()
  });
});

manifest.json

{
  "manifest_version": 2,
  "name": "Random Links",
  "version": "1.0.0",
  "description": "",
  "browser_action": {
    "default_title": "Random Links"
  },
  "author": "Jake Eaton",
  "permissions": ["tabs"],
  "background": {
    "persistant": false,
    "scripts": [
      "background.js"
    ]
  }
}