Options

To allow users to customize the behavior of your extension, you may wish to provide an options page. If you do, a link to it will be provided from the extensions management page at chrome://extensions. Clicking the Options link opens a new tab pointing at your options page.

Use the $(ref:storage) API to persist these preferences. These values will then become accessible in any script within your extension.

Step 1: Declare your options page in the manifest

{
  "name": "My extension",
  ...
  "options_page": "options.html",
  ...
}

Step 2: Write your options page

Here is an example options page: 
<!DOCTYPE html>
<html>
<head><title>My Test Extension Options</title></head>
<body>

Favorite color:
<select id="color">
 <option value="red">red</option>
 <option value="green">green</option>
 <option value="blue">blue</option>
 <option value="yellow">yellow</option>
</select>

<label>
  <input type="checkbox" id="like">
  I like colors.
</label>

<div id="status"></div>
<button id="save">Save</button>

<script src="options.js"></script>
</body>
</html>

// Saves options to chrome.storage
function save_options() {
  var color = document.getElementById('color').value;
  var likesColor = document.getElementById('like').checked;
  chrome.storage.sync.set({
    favoriteColor: color,
    likesColor: likesColor
  }, function() {
    // Update status to let user know options were saved.
    var status = document.getElementById('status');
    status.textContent = 'Options saved.';
    setTimeout(function() {
      status.textContent = '';
    }, 750);
  });
}

// Restores select box and checkbox state using the preferences
// stored in chrome.storage.
function restore_options() {
  // Use default value color = 'red' and likesColor = true.
  chrome.storage.sync.get({
    favoriteColor: 'red',
    likesColor: true
  }, function(items) {
    document.getElementById('color').value = items.favoriteColor;
    document.getElementById('like').checked = items.likesColor;
  });
}
document.addEventListener('DOMContentLoaded', restore_options);
document.getElementById('save').addEventListener('click',
    save_options);

Important notes