[enw]

I really dislike this (and I tend to love great design and obsess over UX and small details): reduced legibility (small and thin fonts, lower contrast in e.g. inline code, alert boxes all blend in), and reduced information (compatibility table is near useless, missing details in specifications).

Overall this seems like straight out of 2003. The inconsistent border contrasts and weird burgundy red accent only strengthens the feeling of student side project and lack of taste (red does not convey trust).

Also that logo is ugly. It looks frail and awkwardly narrow without being harmonious (see e.g. the tiny gap between /|).

Edit: I just realized every category has a different accent color (compare e.g. HTML and CSS sections). What an absurd joke from Mozilla.

[brimble]

The old version looked more like it was from 2003 than this—but in a good way. It wasn't afraid of making things visually distinct. This one's the modern "consistency over usability" style that's currently in fashion.