Examine source code of GitRec

{
  "name" : "GitRec",
  "description" : "A recommender system for GitHub repositories based on Gorse",
  "version" : "0.12",
  "manifest_version" : 3 ,
  "permissions" : [
    "scripting" ,
    "webNavigation" 
  ],
  "host_permissions" : [
    "https://gitrec.gorse.io/*" ,
    "*://github.com/*" 
  ],
  "action" : {
    "default_icon" : {
      "306" : "logo.png"
    }
  },
  "icons" : {
    "306" : "logo.png"
  },
  "content_scripts" : [
    {
      "matches" : [
        "*://github.com/*" 
      ],
      "js" : [
        "jquery-4.0.0.min.js" ,
        "colors.js" ,
        "content.js" 
      ],
      "run_at" : "document_end" 
    }
  ],
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "zhangzhenghao@hotmail.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "personallyIdentifyingInfo",
          "browsingActivity",
          "websiteActivity",
          "websiteContent"
        ]
      }
    }
  }
}