Examine source code of Popcorn Discord

{
  "name": "Popcorn Discord",
  "version": "0.0.1",
  "manifest_version": 3,
  "description": "Minimizer Discord's Sidebar with Auto Popup",
  "author": "PopcornPlant",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e571c1e-fac7-4aaa-bde5-1115a715f1ed}"
    }
  },
  "action": {
    "default_icon": "icons/icon128.png",
    "default_popup": "src/action/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://discord.com/*",
        "*://discordapp.com/*"
      ],
      "css": [
        "src/inject/inject.css"
      ]
    }
  ]
}