Examine source code of Pullscope

{
  "manifest_version": 2,
  "name": "Pullscope",
  "description": "Automatically apply custom filters to GitHub Pull Request pages",
  "version": "0.1.0",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage",
    "contextMenus",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "pullscope@guidodinello.dev",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Pullscope",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*"
      ],
      "css": [
        "content-scripts/content.css"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}