Examine source code of Stop Auto-Refresh Anchor

{
  "manifest_version": 2,
  "name": "Anchor — Stop Auto-Refresh & Save Scroll",
  "version": "1.1.0",
  "description": "Blocks websites from auto-refreshing when you switch tabs. Saves your exact scroll position so you never lose your place.",
  "browser_specific_settings": {
    "gecko": {
      "id": "anchor-norefresh-scroll@devtools.extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "notifications",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    "injected.js"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png"
    },
    "default_title": "Anchor"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  }
}