Examine source code of Censorify

{
  "manifest_version" : 2 ,
  "name" : "Censorify",
  "version" : "1.0.1",
  "description" : "A firefox extension that censors foul words on a webpage",
  "content_scripts" : [
    {
      "matches" : [
        "<all_urls>" 
      ],
      "js" : [
        "./src/bundle.js" 
      ],
      "run_at" : "document_start" ,
      "all_frames" : true 
    }
  ],
  "commands" : {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+K",
        "mac": "Command+Shift+K"
      },
      "description" : "Open popup window"
    }
  },
  "browser_action" : {
    "default_popup" : "./src/popup/popup.html"
  },
  "icons" : {
    "16" : "./src/assets/icon16.png",
    "32" : "./src/assets/icon32.png",
    "48" : "./src/assets/icon48.png",
    "64" : "./src/assets/icon64.png",
    "128" : "./src/assets/icon128.png"
  },
  "permissions" : [
    "activeTab" ,
    "tabs" ,
    "storage" 
  ],
  "incognito" : "spanning" ,
  "content_security_policy" : "script-src 'self';",
  "browser_specific_settings": {
    "gecko": {
      "id": "{1a3293a4-ac4e-4e09-b893-d9ee32e8a934}"
    }
  }
}