var favTagNodes = $('<div><a class="post-tag">** Error loading favorite tags. **</a></div>')
.load ("/questions #interestingTags>a.post-tag", function (response, status, xhr) {
    var favoriteTags    = favTagNodes.find ("a.post-tag").map ( function () {
        return this.textContent;
    } )
    .get ();

    console.log ("favoriteTags: ", favoriteTags);
} );

{
  "items": [
    {
      "tag_preference_type": "favorite_tag",
      "user_id": 9999999,
      "tag_name": "git"
    }, {
      "tag_preference_type": "favorite_tag",
      "user_id": 9999999,
      "tag_name": "go"
    }, {
      "tag_preference_type": "ignored_tag",
      "user_id": 9999999,
      "tag_name": "java"
    }
    ...
  ],
  "has_more": false,
  "quota_max": 10000,
  "quota_remaining": 9997
}