Examine source code of Web pages scanner

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "2.1.5",
  "default_locale": "en",
  "icons": {
    "24": "icons/icon2.svg",
    "48": "icons/icon.svg"
  },
  "developer": {
    "name": "WaldiPL",
    "url": "https://github.com/WaldiPL/webpageScanner"
  },
  "applications": {
    "gecko": {
      "id": "webpageScanner@waldemar.b",
      "strict_min_version": "63.0a1"
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "alarms",
    "<all_urls>",
    "notifications",
    "contextMenus"
  ],
  "optional_permissions": [
    "bookmarks"
  ],
  "background": {
    "page": "bg.html"
  },
  "sidebar_action": {
    "browser_style": false,
    "default_title": "__MSG_extensionName__",
    "default_panel": "sidebar.html",
    "default_icon": "icons/icon2.svg"
  },
  "browser_action": {
    "browser_style": false,
    "default_title": "__MSG_extensionName__",
    "default_popup": "popup.html",
    "default_icon": {
      "19": "icons/icon2.svg",
      "38": "icons/icon.svg"
    }
  },
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Alt+Q"
      }
    }
  },
  "options_ui": {
    "browser_style": false,
    "page": "options.html#options",
    "open_in_tab": true
  },
  "content_security_policy": "script-src 'self'; object-src 'self'"
}