Examine source code of Mostly Blue by me

{
  "name": "Mostly Blue by me",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "InkedCat_LI.jpg"
    },
    "colors": {
      "toolbar": "rgba(36, 105, 122, 1)",
      "toolbar_field": "rgba(0, 30, 255, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "frame": "rgba(0, 255, 247, 1)",
      "tab_background_text": "rgba(0, 51, 255, 1)",
      "bookmark_text": "rgba(0, 255, 247, 1)"
    }
  }
}