At this point I think Firefox market share stopped being in Mozilla's hand.
Just as it was during the browser war days, the critical issue went back to site compatibility: Firefox performs poorly on Google properties (Gmail is fine, YouTube, gsuite, admin consoles are pretty bad), and document based services like Notion or Figma. It kinda works, but Chrome based browser perform notably better.
The main point of course is that those sites are at fault (sometimea intentionally when it comes to Google), but that doesn't change Mozilla's position. Stop using Google services is just not a great choice, and many of us use them rely heavily on them for work.
Mozilla could make technical miracles and or bring some incredible feature from the left field, but that's a tall order for any company that size, so I'd expect most of their future effort to still end up with lower market share, whether or not they had good ideas.