Examine source code of AutumnIsHere

{
  "name": "AutumnIsHere",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "Copy of 3000x200 Firefox Theme Size(2).png"
    },
    "colors": {
      "frame": "rgba(107, 2, 2, 1)",
      "tab_background_text": "rgba(90, 0, 18, 1)",
      "bookmark_text": "rgba(11, 116, 225, 1)",
      "toolbar_field": "rgba(72, 8, 8, 1)",
      "toolbar_field_text": "rgba(232, 229, 229, 1)"
    }
  }
}