Examine source code of What a Great Link!

{
  "name": "What a Great Link!",
  "version": "1.1resigned1",
  "description": "Use the toolbar icon or Alt + Shift + W to save the page you're viewing to What a Great Link!",
  "manifest_version": 2,
  "permissions": [
    "activeTab"
  ],
  "icons": {
    "16": "images/wagl-logo-rounded-16.png",
    "48": "images/wagl-logo-rounded-48.png",
    "128": "images/wagl-logo-rounded-128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "images/wagl-logo-rounded-16.png",
      "48": "images/wagl-logo-rounded-48.png",
      "128": "images/wagl-logo-rounded-128.png"
    },
    "default_title": "What a Great Link!",
    "default_popup": "popup.html"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "windows": "Alt+Shift+W",
        "mac": "Alt+Shift+W",
        "chromeos": "Alt+Shift+W",
        "linux": "Alt+Shift+W"
      }
    }
  },
  "developer": {
    "name": "What a Great Link!",
    "url": "https://whatagreat.link"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b5904e64-e813-473e-ac0e-fe155f635737}"
    }
  }
}