Examine source code of Feedmark

{
  "manifest_version": 3,
  "name": "Feedmark",
  "version": "0.2.0",
  "description": "An RSS reader built on the bookmark tree.",
  "icons": {
    "16": "icons/feedmark-16.png",
    "32": "icons/feedmark-32.png",
    "48": "icons/feedmark-48.png",
    "96": "icons/feedmark-96.png",
    "128": "icons/feedmark-128.png"
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/feedmark-16.png",
      "32": "icons/feedmark-32.png"
    }
  },
  "permissions": [
    "alarms",
    "storage",
    "bookmarks"
  ],
  "host_permissions": [
    "https://*/*"
  ],
  "minimum_chrome_version": "121",
  "browser_specific_settings": {
    "gecko": {
      "id": "feedmark@jasonbirchall.codeberg.org",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}