Examine source code of Download Attribution

{
  "manifest_version": 3,
  "name": "Download Attribution",
  "version": "1.1",
  "description": "Create text files with attribution information whenever any file begins downloading. The attribution file contains the save-as file name, the original download URL, and the date the download started.",
  "permissions": [
    "storage",
    "downloads",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "data/icons/icon.svg"
  },
  "action": {
    "default_title": "Toggle Attribute Extension"
  },
  "commands": {
    "_execute_browser_action": {}
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1376fa29-1410-4d10-a608-07fd20fc1694}"
    }
  }
}