make firefox to accept puma-dev cert permanently

every time, firefox is restarted, and i'm opening https://gomus.test again, the cert has to be accepted manually again.

* use `open ~/Library/Application\ Support/io.puma.dev/` in terminal to show your local puma-dev certs folder
* enter `about:preferences#privacy` into firefox url-bar
* all the way at the bottom you’ll find _Certificates_
* click on _View Certificates_
* in the last _Authorities_ tab, you can import the Puma-dev certificate you've revealed in first step
* you only need to accept this for websites …

from now on, firefox will without any disturbance open local https:// puma-dev websites.

marcotralles
April 12, 2022