I can't help but feel that 'diversifying' Mozilla's product line up is one of the problems. I'd scrap everything else and just focus on the browser.
I know I have a skewed view of the software market, but I'd pay $$ per year for Firefox. It feels like many businesses would too if it offered some guarantees of data privacy.
Edge feels like it's moving AWAY from enterprises with the recent nonsense integrating deferred payments and price comparison tools. Brave is pushing Crypto which is kryptonite for many orgs. Chrome is feeding ad algorithms. Seems like a gap to me.