Examine source code of Lichess Blindfold Toggle

{
  "manifest_version": 2,
  "name": "Lichess Blindfold Toggle",
  "version": "1.1",
  "homepage_url": "https://github.com/brandon-gong/lichess-blindfold-toggle",
  "description": "A dead-simple extension to easily toggle blindfold mode for Lichess.",
  "icons": {
    "48": "icons/visible_small.png",
    "96": "icons/visible_large.png"
  },
  "page_action": {
    "browser_style": true,
    "default_icon": {
      "48": "icons/visible_small.png",
      "96": "icons/visible_large.png"
    },
    "default_title": "Toggle blindfold",
    "show_matches": [
      "https://*.lichess.org/*"
    ]
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.lichess.org/*"
      ],
      "js": [
        "blindfold.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fb90a367-ebd6-4c2b-9c07-84bae0a8e308}"
    }
  }
}