Examine source code of Hide Reddit Comment Karma

{
  "manifest_version": 2,
  "name": "Hide Reddit comment & post Karma",
  "version": "1.0",
  "description": "Hides the total count of upvotes on comments and posts.",
  "icons": {
    "48": "/icons/AddonIcon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "karmabegone.js"
      ]
    }
  ],
  "permissions": [
    "webRequest"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6bf23320-6abf-4272-9fff-5d4c033a49dc}"
    }
  }
}