Examine source code of Stack Overflow Modern

{
  "manifest_version": 2,
  "name": "Stack Overflow Modern",
  "version": "0.1",
  "description": "Makes Stack Overflow usable",
  "content_scripts": [
    {
      "matches": [
        "https://stackoverflow.com/*"
      ],
      "css": [
        "content.css"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "16.png",
    "32": "32.png",
    "64": "64.png",
    "128": "128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{375a1b95-bbef-4118-9cd8-554687dbfc8b}"
    }
  }
}