Examine source code of Discord Powersave

{
  "manifest_version": 2,
  "name": "Discord Powersave",
  "version": "1.0.2resigned1",
  "description": "Disables spinner animations in Discord",
  "content_scripts": [
    {
      "matches": [
        "https://discordapp.com/*"
      ],
      "css": [
        "powersave.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{12c277ca-4a55-497c-a5d9-c9e12502df54}"
    }
  }
}