Debug extension version 2.1.6 was released containing five enhancements:

• Total request processing time and peak memory consumption were added on index page for each request
• Improved error when no debug data present
• Browser compatibility was improved so toolbar now works with IE and older browsers
• Closures are now serialized with the help of opis/closure eliminating related issues
• Module got tracePathMappings option that allows you to fine tune stacktrace links to work for Docker image with file system mapped to host machine

See the CHANGELOG for details.