Examine source code of GitHub Absolute Dates

{
  "manifest_version": 3,
  "id": "github-absolute-dates",
  "name": "GitHub Absolute Dates",
  "version": "1.0",
  "description": "Convert GitHub's relative timestamps into absolute timestamps.",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "192": "icons/icon192.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://github.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "github-absolute-dates@example.com"
    }
  }
}