Examine source code of bootstrap12

{
  "manifest_version": 2,
  "name": "bootstrap-responsiveHelper",
  "description": "Show the Bootstrap grid class currently active (XS, SM, MD, LG, ..)",
  "version": "1.3.0",
  "homepage_url": "https://github.com/KevinBon/webextension--bootstrap-responsiveHelper",
  "developer": {
    "name": "Kevin BON",
    "url": "https://github.com/KevinBon/webextension--bootstrap-responsiveHelper"
  },
  "icons": {
    "32": "icons/icon.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_area": "tabstrip",
    "default_icon": "icons/icon-light.png",
    "default_title": "Bootstrap - Responsible Helper"
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "web_accessible_resources": [
    "icons/icon-transparent.png"
  ],
  "background": {
    "scripts": [
      "background/bg.responsiveHelper.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_scripts/ct.responsiveHelper.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{00355e4c-dd57-423c-a99a-1c5098b72f16}"
    }
  }
}