Examine source code of Super Secret Viewer

{
  "manifest_version": 2,
  "name": "super-secret-viewer",
  "description": "A viewer for any Super Secret instance !",
  "version": "1.2.0",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "*://*/*"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'; connect-src *",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "100.0",
      "id": "{427b5701-f5e0-4468-9254-f6fb332fdd65}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Login",
    "default_popup": "popup.html"
  }
}