Examine source code of Emojissue

{
  "manifest_version": 2,
  "name": "Emojissue",
  "version": "0.0.4resigned1",
  "description": "Navigate between most positive reacted Github issue comments with just one click.",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "author": "Alpcan Aydın <alpcan@alpcanaydin.com>",
  "homepage_url": "https://github.com/alpcanaydin/emojissue",
  "offline_enabled": true,
  "permissions": [
    "https://github.com/*",
    "tabs",
    "webNavigation"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*/*/issues/*"
      ],
      "css": [
        "emojissue.css"
      ],
      "js": [
        "emojissue.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9d1e91e2-7f33-4d44-b086-f4265705d23b}"
    }
  }
}