The points are: * Force it upon user * Advertising "revert back", which restarts Firefox but Firefox crashes and after another restart forgets its settings -

The points are: * Force it upon user * Advertising "revert back", which restarts Firefox but Firefox crashes and after another restart forgets its settings - no one tested that option * Firebug theme is just a theme, and several features and functionality found in default Firebug are still missing in their DevTools. The usability is different, especially in the AJAX/console tab. And where is a proper DOM tab? * worst thing, it happened during a major incident, I login in remotely to my workstation just to find out my Tool changed under my feet completely, with all prior knowledge useless. I had to use Chrome DevTools which has more features, but even it lacks features as mentioned above - Firebug was the most matured Tool after all. * Firefox still hasn't proper multi-process support, if you understand multi more than two processes. It's a far cry from what IE8+ and Chrome offer.