Examine source code of TooManyTabs

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "TooManyTabs",
    "default_popup": "tabs.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.mozilla.org/*"
      ],
      "js": [
        "background.js",
        "main.js"
      ],
      "css": [
        "tabs.css"
      ]
    }
  ],
  "description": "Browser Extension",
  "homepage_url": "https://github.com/Slad3",
  "manifest_version": 2,
  "name": "Too Many Tabs",
  "icons": {
    "48": "icons/iconRed.png"
  },
  "permissions": [
    "tabs",
    "*://developer.mozilla.org/*",
    "webRequest"
  ],
  "version": "1.0"
}