Unread for GMail

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Unread for GMail",
  "version": "1.0.0",
  "manifest_version": 2,
  "description": "Mark unread GMail emails with a color",
  "homepage_url": "https://www.linkedin.com/in/sachinmrao",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "default_locale": "en",
  "background": {
    "page": "src/bg/background.html",
    "persistent": true
  },
  "options_ui": {
    "page": "src/options_custom/index.html",
    "chrome_style": true
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/mail/*"
      ],
      "css": [
        "src/inject/inject.css"
      ]
    },
    {
      "matches": [
        "https://mail.google.com/mail/*"
      ],
      "js": [
        "src/inject/inject.js"
      ]
    }
  ]
}