Examine source code of Link Shade Sync

{
  "manifest_version": 2,
  "name": "Link Shade Sync",
  "version": "1.0.2",
  "description": "Sync clicked-link shading between Firefox desktop and Firefox for Android.",
  "permissions": [
    "storage",
    "tabs",
    "https://api.github.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_title": "Link Shade Sync",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "link-shade-sync@local.codex",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "browsingActivity",
          "websiteActivity"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}