Examine source code of HighlightAll

{
  "manifest_version": 2,
  "name": "HighlightAll",
  "version": "2.3",
  "description": "__MSG_extensionDescription__",
  "applications": {
    "gecko": {
      "id": "{26FD1F83-A45B-4c74-AF5A-F2EE0EE4D691}",
      "strict_min_version": "57.0"
    }
  },
  "default_locale": "en",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "lib/mark.js",
        "lib/popper.js",
        "lib/tippy-bundle.iife.js",
        "hlall_content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "hlall_bg.js"
    ]
  },
  "permissions": [
    "<all_urls>",
    "notifications",
    "find",
    "storage",
    "contextMenus"
  ],
  "commands": {
    "toggle-hlall": {
      "suggested_key": {
        "default": "Ctrl+F8"
      },
      "description": "Send a 'toggle-hlall' event to the extension"
    }
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "icons": {
    "48": "icons/highlightall_icon.svg",
    "96": "icons/highlightall_icon.svg"
  }
}