# Dash Debugger UI Not Showing

**URL:** <https://community.plotly.com/t/dash-debugger-ui-not-showing/42827>\
**Category:** Dash Python\
**Created:** [July 22, 2020, 11:24pm UTC](https://community.plotly.com/t/dash-debugger-ui-not-showing/42827 "2020-07-22T23:24:53Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sblinz](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@sblinz](https://community.plotly.com/u/sblinz)\
**Post date:** [July 22, 2020, 11:24pm UTC](https://community.plotly.com/t/dash-debugger-ui-not-showing/42827/1 "2020-07-22T23:24:53Z")

</div>

I am running a simple Dash app with debugger turned on but I cannot see it in my browser (e.g., the little round widget at the bottom right) and I don’t see any trace backs when I have an error.

I call `app.server.run(debug=True)` in ` __main__ ` and when the app runs stdout says “Debug mode: on” and “Debugger is active” and “Debugger PIN: XXX”.

I am on Firefox and tried relaxing my cookie settings (i.e., I allow third-party cookies and cookies from unvisited sites). I also don’t see it in Chrome so it must be something with my app.

Any ideas? Is there a special thing (CSS?) that I need to include in my app for the debugger to show in the browser?