Please stop making excuses for Mozilla - their management has made many questionable decisions including bundling unnecessary extensions like Pocket and closed source DRM plugin without user permission, aggressive telemetry tracking, downloading and running codes / features without your knowledge (it's opt-out but only if you know what to opt-out of) and now even bundling adware into the browser.

Instead of ensuring their engine is easily modular and usable they are more concerned about others making competing browsers and thus let greed drive their design decisions to make a clunky and poorly architected product that just lags in development.

Fire the greed driven management of Mozilla, and bring a team more concerned about developing a good product than letting money drive the design decisions, and Firefox will be back on track.