Examine source code of avans-bs-margin-purger

{
  "manifest_version": 2,
  "name": "brightspace-margin-purger",
  "version": "1.0",
  "description": "Purges the rediculous margins on brightspace.avans.nl",
  "icons": {
    "48": "icons/bmp-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.brightspace.avans.nl/*",
        "*://*.brightspace.com/*"
      ],
      "js": [
        "purgewhitespace.js"
      ],
      "all_frames": true
    }
  ]
}