for developers: https://firefox-source-docs.mozilla.org/
all categories: https://www.mozilla.org/en-US/contribute/
unsure how you can help? https://whatcanidoformozilla.org
all categories: https://www.mozilla.org/en-US/contribute/
unsure how you can help? https://whatcanidoformozilla.org
I've found the contribute page, but that leads straight to https://github.com/mdn/archived-content/tree/main/files/en-u...