Examine source code of GMX MailCheck for Firefox

{
  "name": "__MSG_appName__",
  "short_name": "__MSG_appShortName__",
  "description": "__MSG_appDescription__",
  "version": "8.0.18",
  "author": "__MSG_appAuthor__",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "background": {
    "scripts": [
      "js/background-mailcheck.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "images/envelope-19.png",
      "38": "images/envelope-38.png"
    },
    "default_title": "__MSG_browserActionTitle__",
    "default_area": "navbar",
    "browser_style": false
  },
  "content_scripts": [
    {
      "js": [
        "js/identify-to-site-cs.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "matches": [
        "https://*.web.de/*",
        "https://*.gmx.net/*",
        "https://*.gmx.de/*",
        "https://*.gmx.ch/*",
        "https://*.gmx.at/*",
        "https://*.gmx.com/*",
        "https://*.mail.com/*",
        "https://*.1und1.de/*",
        "https://*.1and1.com/*"
      ]
    },
    {
      "js": [
        "js/aib-cs.js"
      ],
      "run_at": "document_idle",
      "matches": [
        "https://*.gmx.net/*",
        "https://*.gmx.at/*",
        "https://*.gmx.ch/*"
      ]
    },
    {
      "js": [
        "js/portal-page-badge-cs.js"
      ],
      "run_at": "document_end",
      "all_frames": true,
      "matches": [
        "https://suche.gmx.net/*",
        "https://suche.gmx.at/*",
        "https://suche.gmx.ch/*"
      ]
    },
    {
      "js": [
        "js/webapp-start-proxy-cs.js"
      ],
      "run_at": "document_end",
      "matches": [
        "https://dl.web.de/backend/post.html",
        "https://dl.gmx.net/backend/post.html",
        "https://dl.gmx.com/backend/post.html",
        "https://dl.mail.com/backend/post.html",
        "https://dl.1und1.de/backend/post.html"
      ]
    },
    {
      "js": [
        "js/backtab-ads-cs.js"
      ],
      "run_at": "document_end",
      "all_frames": true,
      "matches": [
        "https://www.adsensecustomsearchads.com/afs/ads?*",
        "https://www.adsensecustomsearchads.com/afs/ads/*"
      ]
    },
    {
      "js": [
        "js/brand-oauth2-cs.js"
      ],
      "run_at": "document_end",
      "all_frames": true,
      "matches": [
        "https://1und1.de/login/oauth2/*",
        "https://www.1und1.de/login/oauth2/*",
        "https://gmx.net/login/oauth2/*",
        "https://www.gmx.net/login/oauth2/*",
        "https://gmx.com/login/oauth2/*",
        "https://www.gmx.com/login/oauth2/*",
        "https://mail.com/login/oauth2/*",
        "https://www.mail.com/login/oauth2/*",
        "https://web.de/login/oauth2/*",
        "https://www.web.de/login/oauth2/*"
      ],
      "include_globs": [
        "*code=*"
      ]
    },
    {
      "js": [
        "js/microsoft-web-auth-cs.js"
      ],
      "run_at": "document_end",
      "matches": [
        "https://login.live.com/*"
      ],
      "include_globs": [
        "*/oauth20_desktop*code=*",
        "*/oauth20_desktop*error=*"
      ]
    }
  ],
  "web_accessible_resources": [
    "js/aib-consent-war.js"
  ],
  "default_locale": "de",
  "manifest_version": 2,
  "page_action": {
    "default_title": "__MSG_pageActionTitle__",
    "default_icon": {
      "48": "images/search.svg"
    }
  },
  "optional_permissions": [
    "<all_urls>"
  ],
  "applications": {
    "gecko": {
      "id": "toolbar@gmx.net"
    }
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "GMX",
      "keyword": "suche",
      "search_url": "https://suche.gmx.net/web/result?origin=mc_splugin_ff&enc=UTF-8&q={searchTerms}",
      "suggest_url": "https://suggestplugin.ui-portal.de/s?q={searchTerms}&brand=gmx&origin=mc_splugin_ff_sg",
      "favicon_url": "https://img.ui-portal.de/search/img/gmx/favicon_16.ico"
    }
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "management",
    "notifications",
    "contextMenus",
    "identity",
    "search",
    "https://*.gmx.net/*"
  ]
}