Examine source code of Simple Highlighter ev

{
  "manifest_version": 2,
  "name": "Simple Highlighter",
  "version": "1.0",
  "description": "Highlights specific keywords or elements on a webpage.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "webNavigation"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{173b28a3-6a87-4208-999d-af0514cffa04}"
    }
  }
}