Set up my Guix profile so that I can use all the right tools.
#+begin_src sh
export GUIX_PROFILE="/home/chelys/.guix-profile"
source "$GUIX_PROFILE/etc/profile"
#+end_src
Add the system's data directories to =XDG_DATA_DIRS=. Guix will set the =XDG_DATA_DIRS= environment variable, but this will prevent the rest of the system from using the default ones. This causes a crash in Firefox when I try to upload or download files (well, open a file dialog). According to the [[https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html][XDG Base Directory Specification]]:
#+begin_quote
If =$XDG_DATA_DIRS= is either not set or empty, a value equal to =/usr/local/share/:/usr/share/= should be used.