Examine source code of LinkedIn Notifications

{
  "manifest_version": 2,
  "name": "LinkedIn Extension",
  "description": "This extension lights up with a new notification count whenever you have new activity waiting for you at LinkedIn.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "icons": {
    "128": "li-icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.linkedin.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "li-icon16.png",
      "19": "li-icon19.png",
      "32": "li-icon32.png",
      "38": "li-icon38.png"
    }
  },
  "permissions": [
    "https://www.linkedin.com/*",
    "notifications",
    "tabs"
  ],
  "version": "1.20",
  "applications": {
    "gecko": {
      "id": "linkedinConverted@firefox-extension"
    }
  }
}