Examine source code of Open Translate Addon

{
  "manifest_version" : 2 ,
  "name" : "Unofficial LibreTranslate API",
  "version" : "0.2.1",
  "description" : "in place translation to aid language learners with unfamiliar vocabulary",
  "icons" : {
    "1048" : "icons/libtrans_icon_1048_adjusted.png"
  },
  "content_scripts" : [
    {
      "all_frames" : true ,
      "matches" : [
        "<all_urls>" 
      ],
      "js" : [
        "common.js" ,
        "content.js" 
      ]
    }
  ],
  "permissions" : [
    "storage" ,
    "webRequest" ,
    "https://translate.terraprint.co/*" ,
    "http://localhost/*" ,
    "https://libretranslate.com/*" ,
    "https://libretranslate.de/*" ,
    "https://translate.argosopentech.com/*" ,
    "https://trans.zillyhuhn.com/*" ,
    "https://libretranslate.esmailebob.xyz/*" ,
    "https://libretranslate.pussthecat.org/*" 
  ],
  "background" : {
    "scripts" : [
      "common.js" ,
      "background.js" 
    ]
  },
  "browser_action" : {
    "default_title" : "Unofficial LibreTranslate API",
    "default_popup" : "popup.html",
    "default_icon" : {
      "1048" : "icons/libtrans_icon_1048_adjusted.png"
    }
  },
  "options_ui" : {
    "page": "options.html" ,
    "browser_style": true,
    "chrome_style": true
  },
  "broswer_specific_settings": {
    "gecko": {
      "id": "voca@terraprint.co",
      "strict_min_version": "57.0"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{81a3e2b2-02c2-4473-a71d-72e0ea3aec60}"
    }
  }
}