Examine source code of GitHub Recommender

{
  "manifest_version": 2,
  "name": "GitHub Recommender",
  "version": "1.2.0",
  "description": "Get similar repositories on GitHub page",
  "author": "https://indexstorm.com",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "1024": "logo.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://github.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [
    "https://git.indexstorm.com/similar",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{70e5b770-918b-4d4d-a41e-7206016fe206}"
    }
  }
}