Examine source code of MS Online: Stay signed in

{
  "description": "Allows you to skip the 'Stay signed in?' question of Microsoft Online by automatically clicking 'Yes' for you.",
  "manifest_version": 2,
  "name": "Microsoft Online: Stay signed in",
  "version": "1.0.0",
  "homepage_url": "https://github.com/wtimme/firefox-microsoftonline-stay-signed-in",
  "icons": {
    "48": "icons/done_all_FILL0_wght400_GRAD0_opsz48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://login.microsoftonline.com/common/SAS/ProcessAuth"
      ],
      "js": [
        "stay-signed-in.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{608bd6b7-c0c5-4a0a-81e3-9f43ffac5059}"
    }
  }
}