Examine source code of Page Highlighter

{
  "manifest_version": 2,
  "name": "Page Highlighter",
  "version": "1.0.0",
  "description": "Highlight selected text on any page via a context menu or the popup, using your preferred color.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{d7a2c7b9-9d71-4a2e-9ea8-7f6f8bcb733a}",
      "strict_min_version": "58.0"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Page Highlighter",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "content_security_policy": "script-src 'self'; object-src 'self'"
}