Examine source code of Timestamp Decoder

{
  "manifest_version": 2,
  "name": "Timestamp Decoder",
  "version": "0.2.2",
  "author": "noir04",
  "description": "Will decode unix timestamps into a human readable format",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "foreground.js"
      ]
    }
  ],
  "permissions": [
    "<all_urls>",
    "clipboardWrite",
    "notifications",
    "contextMenus",
    "activeTab"
  ]
}