after to much try an error,
(sorry for the downtime)
I figured out how to patch mastodon to change basic stuff like max char limit or favicon.

I was first thinking this should be easy with nixos, simply override the src of the derivation.
but some cascade deps and not overriding that another workaround was needed.

#milliways #sysadmin

here is the final patch one:

@mozilla you make it really hard to use firefox,... https://support.mozilla.org/en-US/kb/sponsor-privacy?as=u&utm_source=inproduct

Warning Ads:
Luckly I can disable this, @debian can you change the default config here?