Examine source code of Discord Dimer

{
  "manifest_version": 2,
  "name": "Dimer",
  "version": "0.2",
  "description": "Display local time on discord. Always.",
  "icons": {
    "48": "/icon.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "48": "/icon.png"
    },
    "default_title": "Dimer"
  },
  "content_scripts": [
    {
      "matches": [
        "*://discord.com/*"
      ],
      "js": [
        "dime.js"
      ]
    }
  ]
}