Examine source code of Adorable Git Graph

{
  "manifest_version" : 3 ,
  "name" : "Adorable Git Graph",
  "version" : "0.2.0",
  "default_locale" : "en" ,
  "description" : "__MSG_description__" ,
  "icons" : {
    "16" : "icons/icon-16.png",
    "32" : "icons/icon-32.png",
    "48" : "icons/icon-48.png",
    "128" : "icons/icon-128.png"
  },
  "action" : {
    "default_title" : "__MSG_actionTitle__" ,
    "default_icon" : {
      "16" : "icons/icon-16.png",
      "32" : "icons/icon-32.png"
    }
  },
  "content_scripts" : [
    {
      "matches" : [
        "https://github.com/*" 
      ],
      "js" : [
        "content.js" 
      ],
      "run_at" : "document_idle" 
    }
  ],
  "options_ui" : {
    "page": "options.html" ,
    "open_in_tab": true
  },
  "permissions" : [
    "storage" 
  ],
  "host_permissions" : [
    "https://api.github.com/*" 
  ],
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "adorable-git-graph@stephen.taipei",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "browsingActivity"
        ],
        "optional": [
          "authenticationInfo"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}