Examine source code of Video Styler (brightness and more)

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "__MSG_extension_name__",
  "short_name": "__MSG_extension_title__",
  "version": "1.3.3",
  "description": "__MSG_extension_descr__",
  "default_locale": "en",
  "icons": {
    "16": "icons/16x16.png",
    "48": "icons/48x48.png",
    "128": "icons/128x128.png"
  },
  "author": "ebNULL",
  "permissions": [
    "alarms",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": {
      "19": "icons/19x19.png",
      "38": "icons/38x38.png"
    },
    "default_title": "__MSG_extension_title__",
    "default_popup": "browseraction/popup.html"
  },
  "background": {
    "scripts": [
      "vendor/ebnull-notifier.min.js",
      "vendor/ext-single-page-opener.min.js",
      "vendor/ext-storage-manager.min.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentscripts/content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "icons/*.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1e06b4f5-4854-4f87-be8d-16e431c9a70e}"
    }
  }
}