Examine source code of append_date

{
  "manifest_version": 2,
  "name": "append_date",
  "version": "1.4",
  "description": "Save webpages appending the current date to the title.",
  "browser_specific_settings": {
    "gecko": {
      "id": "append_date@crap0101.com",
      "strict_min_version": "106.0"
    },
    "gecko_android": {
      "id": "append_date@crap0101.com",
      "strict_min_version": "113.0"
    }
  },
  "icons": {
    "48": "icons/append_date-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icons/append_date-32.png",
    "default_title": "append date"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "append-date.js"
      ]
    }
  ]
}