Examine source code of justsayit

{
  "manifest_version" : 2 ,
  "name" : "justsayit",
  "version" : "1.3.1",
  "description" : "An extension for Firefox that enables voice dictation on any website. Web Dictate can be used with any Whisper API service (including locally hosted).",
  "author": "Failmode",
  "homepage_url" : "https://github.com/mbailey/justsayit",
  "browser_specific_settings": {
    "gecko": {
      "id": "justsayit@example.com",
      "strict_min_version": "79.0"
    }
  },
  "privacy_policy": "privacy_policy.md",
  "icons" : {
    "16" : "icons/sayit-16.png",
    "32" : "icons/sayit-32.png",
    "48" : "icons/sayit-48.png",
    "96" : "icons/sayit-96.png"
  },
  "permissions" : [
    "activeTab" ,
    "storage" ,
    "<all_urls>" ,
    "tabs" ,
    "notifications" ,
    "contextMenus" 
  ],
  "browser_action" : {
    "default_icon" : {
      "16" : "icons/sayit-16.png",
      "32" : "icons/sayit-32.png"
    },
    "default_title" : "justsayit"
  },
  "background" : {
    "scripts" : [
      "background.js" 
    ],
    "persistent" : true 
  },
  "content_scripts" : [
    {
      "matches" : [
        "<all_urls>" 
      ],
      "js" : [
        "content.js" 
      ],
      "css" : [
        "content.css" 
      ]
    }
  ],
  "options_ui" : {
    "page": "options/options.html" ,
    "open_in_tab": true
  }
}