Visited links
Restricting NumericUpDown control input How do I make a textbox that only accepts numbers? Rebase help on Github Git Cheatsheet git ready: a blog of git tips At A Distance: a game.
Miscellanea
I should write an extension that copies link text and pastes a Markdown-formatted link. That would make link blogging easier. Basically, it would take a link, and output:
[%link_text%](%href%)
This probably exists, but I haven't found it yet.