Examine source code of Planet Minecraft Enhancer

{
  "name": "Planet Minecraft Enhancer",
  "version": "1.6",
  "description": "Helps to hide spammy submissions to offer you a better experience.",
  "author": "ReweMC",
  "manifest_version": 2,
  "browser_action": {
    "default_icon": "64x64.png",
    "default_popup": "settings.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.planetminecraft.com/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "icons": {
    "64": "64x64.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "webRequest"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ext@deepslatemc.de"
    }
  }
}