Examine source code of Text2Chart GitHub Previewer

{
  "manifest_version" : 3 ,
  "name" : "Text2Chart GitHub Previewer",
  "version" : "1.0",
  "description" : "Preview .stflow files as charts on GitHub using Text2Chart.js",
  "author": "SoloThought",
  "homepage_url" : "https://github.com/solothought/Text2Chart",
  "icons" : {
    "32" : "icons/Text2Chart_logo-32.png",
    "64" : "icons/Text2Chart_logo-64.png",
    "128" : "icons/Text2Chart_logo-128.png"
  },
  "host_permissions" : [
    "*://github.com/*" 
  ],
  "content_scripts" : [
    {
      "matches" : [
        "*://github.com/*" ,
        "*://www.github.com/*" 
      ],
      "js" : [
        "content.js" 
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "solothought.official@gmail.com"
    }
  }
}