Examine source code of ProWriter German

{
  "name": "__MSG_extensionName__",
  "short_name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "icons": {
    "16": "assets/icons/mentor16.png",
    "32": "assets/icons/mentor32.png",
    "48": "assets/icons/mentor48.png",
    "128": "assets/icons/mentor128.png"
  },
  "version": "1.2.9",
  "manifest_version": 2,
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "http://*/*",
    "https://*/*",
    "webRequest",
    "webNavigation"
  ],
  "background": {
    "scripts": [
      "/backgroundscript.bundle.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "/contentscript.bundle.js"
      ],
      "matches": [
        "*://*.web.de/*",
        "*://*.gmx.de/*",
        "*://*.gmx.net/*"
      ],
      "all_frames": true,
      "match_about_blank": true
    }
  ],
  "browser_action": {
    "default_popup": "/page/popup.html"
  },
  "web_accessible_resources": [
    "assets/logo/*.svg",
    "assets/icons/user.svg",
    "assets/icons/mentor.svg",
    "assets/icons/goodexample.svg",
    "assets/icons/badexample.svg",
    "assets/Publico/*.woff",
    "assets/Publico/*.woff2",
    "assets/Theinhardt/*.woff",
    "assets/Theinhardt/*.woff2"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{017328fc-da0d-1b06-aada-21db237f3b8c}"
    }
  }
}