Examine source code of Discord Block Fixer

{
  "manifest_version": 2,
  "name": "Discord Block Fixer",
  "version": "1.1",
  "description": "Removes the ability to read blocked messages on Discord's web app.",
  "icons": {
    "48": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.discord.com/*"
      ],
      "js": [
        "DiscordBlockFixer.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ceb316e6-a005-4f83-a1c6-935c67278bb5}"
    }
  }
}