I guess Opera's release and development cycle(s) is why it is so popular!

Actually, Opera doesn't have nightlies. Weeklies at best most of the time. And there's no "bleeding-edge" build available. They have the next major version cooking apparently, but they aren't sharing anything until they have exhausted 10.x it seems. Firefox and Chrome, on the other hand, have nightlies of both current and future releases.

Even better, define new LaTeX commands for the stuff you write repeatedly. This way, I was able to write my calculus notes in plain LaTeX quite effectively. For example, here are a few I had:

\newcommand{\fint}{\int_a^b f(x) \,\mathrm{d} x}

\newcommand{\ixi}{\langle x_{i-1}, x_i \rangle}

\newcommand{\non}{_{n=0}^\infty}

\newcommand{\mr}{\sum\non a_nx^n}