Examine source code of classic actors

{
  "theme": {
    "images": {
      "theme_frame": "firefoxbanner.png"
    },
    "colors": {
      "frame": "#5a03fc",
      "tab_background_text": "#c4c0c0"
    }
  },
  "version": "2.0",
  "name": "classic actors",
  "manifest_version": 2,
  "description": "some of my favorite actors"
}