Like ‘calculate-anything’, needs simpleeval library:
~$ pipx install simpleeval
No apps associated with package simpleeval or its dependencies. If you are attempting to install a library, pipx should not be used. Consider using pip or a similar tool instead.
~$ pip install simpleeval
error: externally-managed-environment
× This environment is externally managed
╰─> To install Python packages system-wide, try pacman
~$ yay -Ss simpleeval
aur/python-simpleeval 0.9...
A simple, safe single expression evaluator library.
What to do, install from AUR?
I would recommend you to install it from the aur, so it will still be managed by your package manager.
Extension still didn’t work then since a few months and seems abandoned anyway, so that’s that.