Examine source code of Following Only

{
  "manifest_version": 2,
  "name": "Following Only",
  "version": "1.1",
  "description": "Makes twitter bring you to the Following tab no matter what.",
  "icons": {
    "32": "icons/icon32.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://twitter.com/home"
      ],
      "js": [
        "FollowingOnly.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a599ef9d-59f5-4506-b3a9-5586978743d5}"
    }
  }
}