Examine source code of Tamil Phonetic Input

{
  "manifest_version": 2,
  "name": "Tamil Phonetic Input",
  "version": "0.0.1",
  "description": "Transliterates romanized Tamil input to Tamil script in text fields. Press space to convert the previous word.",
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "tamilPhonetic.js",
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "commands": {
    "toggle-transliteration": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y"
      },
      "description": "Toggle Tamil Transliteration"
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "Toggle Tamil Phonetic Input"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tamil-phonetic-im-js@example.com",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}