Examine source code of Open to Repair

{
  "theme": {
    "images": {
      "theme_frame": "test.jpg"
    },
    "colors": {
      "frame": "#3361b0",
      "tab_background_text": "#184b9e"
    }
  },
  "version": "2.0",
  "name": "Open to Repair",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/2878c88914b224554aed70145023ac38cf713261439447aae75ea0c74982e1b4/http%3A//open-to-repair.fr\" rel=\"nofollow\">http://open-to-repair.fr</a>"
}