Examine source code of History & Cache Cleaner

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "__MSG_name__",
  "description": "__MSG_description__",
  "default_locale": "en",
  "icons": {
    "16": "img/icon_16.png",
    "48": "img/icon_48.png",
    "128": "img/icon_128.png"
  },
  "browser_action": {
    "default_icon": {
      "38": "img/icon_38.png"
    },
    "default_title": "__MSG_name__",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "js/background.js",
      "js/shortcuts.js"
    ]
  },
  "commands": {
    "clear": {
      "suggested_key": {
        "default": "Alt+C",
        "mac": "Alt+C"
      },
      "description": "Clear"
    }
  },
  "content_scripts": [
    {
      "js": [
        "js/content.js"
      ],
      "css": [
        "css/content.css"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_page": "options.html",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "browsingData",
    "tabs",
    "cookies",
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "alarms"
  ],
  "web_accessible_resources": [
    "img/*",
    "audios/*"
  ],
  "version": "1.0.15"
}