I’m a member (since 2007!) of Mozilla Corporation’s User Experience team, where I work on the user-interface and interaction-design of Firefox.
Marginalia are the jotted notes, scribbles, and editorial comments made in the margin of a book (Wikipedia). In other words, some quick personal commentary, hopefully insightful, about the subject at hand.
I have another, non-Mozilla-focused, blog over at madhava.com/egotism, which may be of interest if you find me fascinating.