Firefox as default browser
I've generally been happy switching to FF ever since Quantum came out. Two things continue to sting a little: performance on large DOMs seem to have deteriorated and stale content (especially on revisit or re-open after close) is a pest.
A Mastodon instance for maths people. The kind of people who make \(\pi z^2 \times a\) jokes.
\) for inline LaTeX, and
\] for display mode.