Examine source code of Image History Tracker

{
  "manifest_version": 2,
  "name": "Image History Tracker",
  "version": "1.0",
  "description": "Track viewed image URLs and show them in a dedicated tab.",
  "permissions": [
    "storage",
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{44044580-3144-4815-87a1-eb94d0f73aa8}"
    }
  }
}