Examine source code of Rainbow Tomatoes

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Rainbow Tomatoes",
  "manifest_version": 2,
  "description": "Source image: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/9ce499b410dcdff6890017126ab51ed6e1c149ec03dfd3008c92462e41a180a7/https%3A//pixabay.com/en/tomatoes-tomato-color-rainbow-1220774/\">https://pixabay.com/en/tomatoes-tomato-color-rainbow-1220774/</a>"
}