Examine source code of Diff Navigator for GitHub

{
  "name": "Diff Navigator for GitHub",
  "version": "1.0",
  "manifest_version": 2,
  "description": "GitHub Diff Navigator allows you to easily navigate through the changes in a file that has been edited on GitHub.",
  "page_action": {
    "default_title": "Diff Navigator for GitHub",
    "default_popup": "html/popup.html"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "declarativeContent"
  ],
  "icons": {
    "16": "img/icon-16.png",
    "48": "img/icon-48.png",
    "128": "img/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*/edit/*",
        "http://github.com/*/edit/*"
      ],
      "js": [
        "js/githubDiffNav.js"
      ]
    }
  ],
  "homepage_url": "https://github.com/daattali/github-diff-navigator-extension"
}