Firefox isn't the default browser on any of the popular consumer operating systems, so people don't need a reason to switch from it, they need a reason to switch to it.
Which Mozilla could provide if they'd spend more resources on Firefox and less on random tangents.
But now Google is doing their work for them by making Chrome worse:
Google ad campaigns, some years where Chrome genuinely felt snappier, Google pushing Chrome everywhere, Google sabotaging Firefox on their own websites.
Generally speaking, we have seen that people are okay with handing over the web and all their data to Google, if a button press registers 20ms faster.
