Retina Check Extension

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Retina Check Extension",
  "short_name": "Retina",
  "version": "0.2.9",
  "manifest_version": 2,
  "description": "Is your website retina-ready? Visualise aspect ratios for all images and backgrounds on the page",
  "homepage_url": "http://retinaextension.com",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png",
    "256": "icons/[email protected]"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png",
      "256": "icons/[email protected]"
    },
    "default_popup": "popup.html"
  },
  "default_locale": "en",
  "permissions": [
    "tabs",
    "activeTab",
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "src/inject/inject.css"
      ]
    }
  ]
}