Various anomalies in rendering persist throughout the UI when using Firefox.
As an example (but not the only one) pasting a large script into the Mini-IDE causes indents in the lines to double each line, rendering the script unreadable.
To reproduce, use Firefox, then:
Please see Jonathan Wise for a rant on why Chromium-based browsers are evil, and why its critical that alternative web rendering engines be support to maintain an open web.