Examine source code of Keywords Highlighter

{
  "manifest_version": 2,
  "name": "Keywords Highlighter",
  "version": "1.2",
  "description": "Highlight keywords on any web page from the popup.",
  "icons": {
    "16": "icons/16.png",
    "24": "icons/24.png",
    "32": "icons/32.png",
    "64": "icons/64.png",
    "128": "icons/128.png",
    "256": "icons/256.png",
    "512": "icons/512.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "64": "icons/64.png"
    },
    "default_popup": "popup.html",
    "default_title": "Keywords Highlighter"
  },
  "content_scripts": [
    {
      "css": [
        "css/content.css"
      ],
      "js": [
        "js/content.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5d6e0799-691c-45cd-b6a5-607acf389ea8}"
    }
  }
}