Examine source code of Spell Checker

{
  "manifest_version": 2,
  "name": "SpellCheck Fixer",
  "version": "2.1.1",
  "description": "Quickly fix spelling mistakes with Ctrl+Space - Optimized for speed and accuracy.",
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{82162bf2-ea84-41c1-828a-aa39a872f08a}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "commands": {
    "fix-spelling": {
      "suggested_key": {
        "default": "Ctrl+Space"
      },
      "description": "Fix Spelling Mistake using keyboard shortcut in Firefox"
    }
  }
}