While it may not be as useful as my last extension, I whipped up a quick extension this week called HTMLEscaper. All it does is escape HTML. I know - not very exciting, right?
After switching to PrismJS I realized that I needed to escape any HTML characters in my code samples. I've been using this tool (HTMLEscape.net) but I really wanted something in Brackets. Here is a quick screen shot of it in action:
You can install it now via the Brackets Extension manager or grab the code on GitHub: https://github.com/cfjedimaster/brackets-htmlescaper.