emoji-selector-for-gnome VS gnome-shell-extension-freon

You can also use this GNOME extension.

Or just use a different emoji picker like https://github.com/maoschanz/emoji-selector-for-gnome

I imagine you are using GNOME? In that case you can use the extension called freon: https://extensions.gnome.org/extension/841/freon/

It would be cool to check your PC temperature, with either a gnome extension https://extensions.gnome.org like freon or install lm-sensors and logging the temperatures. as u/spxak1 said It's probably because your PC is being taxed and tries to cool down your system.

Freon is a nice Gnome Shell for this purpose, it works quite well. Make sure you check their wiki for the dependencies:

Probably. Freon, specifically, runs nvidia-smi, it wakes the device up each time it queries the temperature - if GPU temperature reporting is enabled.

I'm using Freon on Pop!_OS 21.10, and I see a number of sensors detected in my Thelio Mira. I wasn't able to find anywhere in the System76 docs about what each of these may be. The GPU, CPU cores, and disk temp sensors are obvious. I'm wondering where I can find docs or info on what "Composite", "PackageID", "Sensor 1",. "Sensor 2", and "temp1" are measuring.

You still need lm-sensors but there are multiple GUI alternatives to sensors. Simplest is probably xsensors and there are also some GNOME extensions that display data from lm-sensors, like Freon for example (I am not GNOME users so I don't have personal experience with it, but it has good reviews).