I don't see the removal of features as evidence of a failure. If anything, it's something a lot of people in the niche browser market have wanted from Firefox for a long time.
When Mozilla adds
- AI toolbars and
- AI windows and
- AI context menu options and
- AI summaries and
- a shopping toolbar and
- advertisements disguised as news and
- advertisements disguised as frequently visited sites and
- advertisements disguised as a handy weather widget and
- an invisible advertisement framework and
- a Tab Notes feature that was already an extension and
- a VPN that basically was already an extension
I see this as desperation.