Examine source code of KeywordKolor Highlighter

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "1.3",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "57.0",
      "id": "{b45b55ae-e82d-4003-b6f9-23fa3326ff3e}"
    }
  },
  "background": {
    "scripts": [
      "is-valid-domain.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "micromodal.min.js",
        "TextHighlighter.js",
        "content-script.js"
      ],
      "css": [
        "content-script.css"
      ]
    }
  ],
  "permissions": [
    "menus",
    "tabs",
    "activeTab",
    "storage",
    "<all_urls>",
    "notifications"
  ],
  "icons": {
    "16": "icons/markerIcon1.png",
    "32": "icons/markerIcon1.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/markerIcon1.png",
      "32": "icons/markerIcon1.png"
    },
    "default_title": "__MSG_extensionName__",
    "default_popup": "settings/index.html",
    "theme_icons": [
      {
        "light": "icons/markerIcon1.png",
        "dark": "icons/markerIcon1.png",
        "size": 16
      },
      {
        "light": "icons/markerIcon1.png",
        "dark": "icons/markerIcon1.png",
        "size": 32
      }
    ]
  }
}