Examine source code of Indic Input

{
  "name": "Indic Input",
  "description": "Enables to type in Indian languages in your browser",
  "version": "0.2.6",
  "author": "Sai Karthik",
  "homepage_url": "https://git.fosscommunity.in/kskarthik/indicinput",
  "manifest_version": 2,
  "icons": {
    "32": "icons/32.png",
    "64": "icons/64.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/32.png",
    "default_title": "Indic Input",
    "default_popup": "options/options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "indicinput.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "switch-layout": {
      "suggested_key": {
        "default": "Ctrl+Space",
        "linux": "Ctrl+Space"
      },
      "description": "Keyboard layout switch"
    }
  },
  "applications": {
    "gecko": {
      "id": "{3294b874-a429-4856-bf67-57f84efa0002}"
    }
  }
}