Examine source code of background

{
  "name": "background",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "dfghnm,nbvdcsxxcvbnm.jpg"
    },
    "colors": {
      "frame": "rgba(242, 215, 12, 0.45)",
      "tab_background_text": "rgba(255, 196, 0, 1)",
      "toolbar": "rgba(36, 36, 36, 0.43)",
      "bookmark_text": "rgba(247, 198, 0, 1)",
      "toolbar_field": "rgba(255, 196, 0, 0.43)",
      "toolbar_field_text": "rgba(78, 3, 158, 1)",
      "tab_line": "rgba(250, 213, 3, 1)"
    }
  }
}