I tried contributing and there are so many entrenched "don't touch my stuff" senior editors or moderators that it's often hard to do much of anything depending on where you are. I gave up after spending 40+ hours attempting to help clean up little known articles of a genre of music only to have 90% of what I did get reversed even though I am very confident it was within wikipedia guidelines. I was also harassed and accused of racism (by the subject of the article) after nominating his article for deletion because it didn't meet notability requirements.

Sadly this is not what happened with Mozilla.

Isn't it? Mozilla has cut or spun-off basically everything other than Firefox.

The most prominent project on mozilla.org at time of writing is Mozilla VPN. Pocket also gets substantial screen space dedicated: https://www.mozilla.org/en-GB/

Fair, though I would argue that those services are much more closely tied to the core experience of Firefox (and in particular the promise of safer, more private internet access) than something like Sunbird ever was.

Pocket and Mozilla VPN are prominent because they drive revenue which is useful to limit dependency on Google, thus greatly helping Firefox.

Pocket generates revenue for Mozilla.