Examine source code of eCourse Folder Expander

{
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  "description": "__MSG_extensionDescription__",
  "version": "1.2.2",
  "default_locale": "el",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "permissions": [
    "activeTab"
  ],
  "host_permissions": [
    "https://ecourse.uoi.gr/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://ecourse.uoi.gr/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ecourse-expander@bill.gr",
      "strict_min_version": "109.0"
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}