https://wiki.mozilla.org/MDN/Development/Contribute/Design
"Are you motivated to make software better? Do you have an eye for
design, usability, or user experience? The Mozilla Developer Network is
looking for motivated individuals to share their thoughts on changes we
make to the site. ....
"Explore your options. Take a look at our progress board
<https://mdn.kanbanery.com/projects/32137/board/>. Everything in the
Design column is ready for discussion. Graphic design, usability, user
experience, and even just opinion. Nothing it out of the question here."
Thought volunteers on this list might be interested in giving it a try!
--
Sumana Harihareswara
Engineering Community Manager
Wikimedia Foundation