Examine source code of Alexa Quick Search

{
  "manifest_version": 2,
  "name": "Alexa Quick Search",
  "version": "1.3resigned1",
  "description": "Alexa Quick Search access your search engines in a popup panel when you select text in a webpage. Context search menu also included!",
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "background": {
    "scripts": [
      "quickSearch.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "aryan.satish16@gmail.com"
    }
  },
  "options_ui": {
    "browser_style": true,
    "page": "settings/settings.html"
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "clipboardWrite",
    "contextMenus",
    "storage",
    "tabs",
    "downloads",
    "webNavigation"
  ],
  "commands": {
    "open-popup": {
      "suggested_key": {
        "default": "Ctrl+Shift+Space"
      },
      "description": "Key combination to open popup"
    },
    "toggle-auto-popup": {
      "suggested_key": {
        "default": "Ctrl+Shift+U"
      },
      "description": "Key combination to toggle auto popup opening"
    }
  },
  "web_accessible_resources": [
    "res/*"
  ]
}