Check the wording. I said Mozilla, not Firefox.
I think Firefox is a great product and want it to succeed, but lately Mozilla has been burning its reputation by chasing the advertising and AI trends. Make no mistake, they are a for-profit company. That doesn’t mean their products should be shunned, but they shouldn’t be exempt from skepticism and rational distrust simply for being the lesser evil.
There are no “problems” with Firefox. The problems are with Mozilla and how they operate Firefox, so they could easily start affecting Thunderbird too.