Examine source code of FetchFox - Curation Collector

{
  "manifest_version": 2,
  "name": "FetchFox - Curation Collector",
  "version": "0.5.1",
  "description": "Collects metadata of the current page and saves it to browser.storage.local for content curation",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "144": "icons/icon-144.png",
    "256": "icons/icon-256.png",
    "512": "icons/icon-512.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": {
      "512": "icons/icon-512.png"
    },
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e6c9d583-ae72-4f1d-8fe2-ea14b70b3b1d}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "<all_urls>",
    "downloads",
    "tabs"
  ]
}