Examine source code of Zombocam

{
  "manifest_version": 2,
  "name": "Zombocam",
  "description": "Add filters to your videos",
  "version": "0.0.21resigned1",
  "permissions": [
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "http://*/",
    "https://*/"
  ],
  "icons": {
    "48": "icons/zombocam-logo-48px.png",
    "96": "icons/zombocam-logo-96px.png"
  },
  "browser_action": {
    "default_icon": "icons/zombocam-logo-256px.png",
    "default_title": "Zombocam"
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "zombocam.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{837819ff-f1c7-48c7-87f4-838d878d72bc}"
    }
  }
}