Examine source code of PlaylistClipper

{
  "manifest_version": 2,
  "name": "PlaylistClipper",
  "version": "1.0",
  "description": "Save lightweight clips (domain+URL+start+end+note) from any web player into an internal playlist. Export JSON/CSV.",
  "icons": {},
  "permissions": [
    "storage",
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_title": "PlaylistClipper",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c1d3fe65-1fb1-4dd4-a822-049aa08d2d6e}"
    }
  }
}