If you've read this far, it's time to set up your editor. Mu is really intended to be read interactively rather than on a browser.
There is rudimentary syntax highlighting support for Mu and SubX files for
various editors. Look for your editor in mu.* and subx.*, and follow the
instructions within.
The Vim files are most developed. In particular, I recommend some optional setup in subx.vim to use multiple colors for comments.
If you use ctags for jumping easily
from names to their definitions in your editor, set it up to load mu.ctags.
For classic Exuberant Ctags, copy it into ~/.ctags. For the newer Universal
Ctags, copy it into ~/.ctags.d/mu.ctags.
Here are some tips on my setup for quickly finding the right opcode for any situation from within Vim.