Examine source code of Tab URL Actions

{
  "manifest_version": 2,
  "name": "Tab URL Actions",
  "description": "Quickly navigate to a new URL based on active tab",
  "version": "0.2.2",
  "applications": {
    "gecko": {
      "id": "tab-url-actions@webext.woky.biz"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+R"
      }
    }
  },
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": "icon26.png",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "web_accessible_resources": [
    "defconfig.txt"
  ]
}