Examine source code of Night Shift Pro

{
  "version": "0.2.3resigned1",
  "name": "Night Shift Pro",
  "manifest_version": 2,
  "short_name": "M Night Pro",
  "description": "Night Shift Dark extention for the web modify CSS",
  "background": {
    "page": "lib/chrome/background.html"
  },
  "permissions": [
    "storage",
    "<all_urls>",
    "contextMenus"
  ],
  "web_accessible_resources": [
    "data/content_script/*.css"
  ],
  "homepage_url": "http://milart-studio.tk",
  "options_ui": {
    "chrome_style": true,
    "page": "data/options/options.html"
  },
  "browser_action": {
    "default_title": "Night Shift Pro",
    "default_icon": {
      "16": "data/icons/dark/16.png",
      "32": "data/icons/dark/32.png"
    }
  },
  "content_scripts": [
    {
      "all_frames": true,
      "match_about_blank": true,
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start",
      "js": [
        "data/content_script/inject.js"
      ]
    }
  ],
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "128": "data/icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6f04b617-f9f9-4bf3-beb5-15532163cfe6}"
    }
  }
}