Mozilla is reintroducing support for web apps in Firefox, allowing for improved integration and usability. However, many users express frustration over Firefox's UI choices, particularly regarding the lack of a minimal browser frame, which hampers true web app functionality. Critics highlight that Firefox has not aligned its developments with user expectations over the past decade. There's a perception that Mozilla has strayed from its core user base, leading to calls for a focus on advanced users or simpler browser variants. The sentiment among some users is that Firefox is lagging behind emerging competitors that prioritize user needs, potentially risking its relevance in the market.