Examine source code of SKJOLDET - The Shield

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "version": "1.6.2",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "<all_urls>",
    "https://api.skjoldet.dk",
    "https://skjoldet.com",
    "https://www.skjoldet.com",
    "https://api.skjoldet.com"
  ],
  "default_locale": "en",
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "SKJOLDET",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f1f04625-3b82-4dfa-ade7-121154711b2c}"
    }
  }
}