Netatmo CO₂ Indicator от freaktechnik

See the current CO₂ level in your browser toolbar. Can additionally show the ppm value directly as badge and color your browser in the CO₂ status color.

Clicking on the toolbar button opens your Netatmo dashboard.

The boundaries for the colors can be freely adjusted and the whole-browser coloring can be reserved to only apply when the status is not green.

Can show notifications when concentration rises above the individual color thresholds or goes back down to normal.

Supports Netatmo Weather stations and Health Coaches.

This extension directly interacts with the Netatmo data and saves the measurements to your local device. No third party server or server from the developer are involved.

Alert sounds
If you want sounds for you notifications and Firefox doesn't make a sound by default, you can use the Notification Sound extension to get a sound whenever a notification is displayed.