Examine source code of WaniKani Context Hider

{
  "manifest_version": 3,
  "name": "WaniKani Context Sentence Hider",
  "version": "1.0.0",
  "description": "Adds ability to hide context sentences in Wani Kani Lessons",
  "browser_specific_settings": {
    "gecko": {
      "id": "waniKaniContextSentenceHider@example.com"
    },
    "gecko_android": {
      "id": "waniKaniContextSentenceHider@example.com"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.wanikani.com/*"
      ],
      "js": [
        "js/contextSentenceHider.js"
      ],
      "run_at": "document_start"
    }
  ]
}