I always meant to look into more features and configuration of CodeMirror, but this work got lost in the much larger pile of work to migrate to WebExtensions. At a minimum I'd find the bracket matching feature useful, but there are many to consider.

• https://codemirror.net/5/doc/manual.html#config
• https://codemirror.net/5/doc/manual.html#addons