Examine source code of Silly Bird

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#c2bcbc",
      "tab_background_text": "#fcffb2"
    }
  },
  "version": "2.0",
  "name": "Silly Bird",
  "manifest_version": 2,
  "description": "'Silly Bird\" watching me as I'm watching you. Sitting up in that branch making all that noise. Moving your head back and forth as I move mine... You sure are a silly bird...."
}