Examine source code of MirrorTab

{
  "manifest_version": 2,
  "name": "MirrorTab",
  "version": "1.0",
  "description": "Open a live camera 'mirror' in a new tab with dynamic stylistic filters (mosaic, anime-like, feedback, mirror, etc.).",
  "icons": {
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "browser_action": {
    "default_title": "MirrorTab",
    "default_icon": "icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "mirror.html",
    "mirror.js",
    "style.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4911070b-68d1-47ef-97ee-596846a58faf}"
    }
  }
}