Examine source code of Happy Hanukkah

{
  "theme": {
    "images": {
      "theme_frame": "Hanukkah-Header.jpg"
    },
    "colors": {
      "frame": "#575757",
      "tab_background_text": "#fafafa"
    }
  },
  "version": "2.0",
  "name": "Happy Hanukkah",
  "manifest_version": 2,
  "description": "Hanukkah Chanukah  \nFlames change to reflect each day of Hanukkah.\nLook best with tabs on top (right click \"Home\" button make sure \"tabs on top\" is checked)"
}