# High CPU usage on FF 119, windows

**URL:** <https://community.fibery.io/t/high-cpu-usage-on-ff-119-windows/5338>\
**Category:** Bugs & Issues\
**Created:** [October 29, 2023, 2:21pm UTC](https://community.fibery.io/t/high-cpu-usage-on-ff-119-windows/5338 "2023-10-29T14:21:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Jose\_Quesada](https://sea2.discourse-cdn.com/flex020/user_avatar/community.fibery.io/jose_quesada/32/5458_2.png) [@Jose\_Quesada](https://community.fibery.io/u/Jose_Quesada)\
**Post date:** [October 29, 2023, 2:21pm UTC](https://community.fibery.io/t/high-cpu-usage-on-ff-119-windows/5338/1 "2023-10-29T14:21:18Z")

</div>

It might be the cocktail of addons, but now when I have fibery running, I can hear the fan. Killing the tab is like Switching it off. On task manager, I can see the effect of fibery being open or not.

It works fine with the same document url on edge.

Any ideas?  
UPDATE: it seems to be an interaction with extension ‘midnight lizzard’ [Midnight Lizard – Get this Extension for 🦊 Firefox (en-US)](https://addons.mozilla.org/en-US/firefox/addon/midnight-lizard-quantum/)

Closing 🙂