Examine source code of CelticTalk Dark v1

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#075400",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "CelticTalk Dark v1",
  "manifest_version": 2,
  "description": "This is an official persona for <a href=\"https://outgoing.prod.mozaws.net/v1/62685405658aae35f07d3fa6cbfc544a78da3ab3c880d9f56ba3cc3081e49c6d/http%3A//www.celtictalk.org\" rel=\"nofollow\">www.celtictalk.org</a>"
}