Emacs and Confluence

Hi,

After successfully avoiding Confluence at work for several years, it
seems like I might start have to using it soon.

I can use Edit with Emacs[1] for Firefox to open a buffer containing
HTML but it is all packed into a single line.  I have seen suggestions
that 'sgml-pretty-print' might help, but running this gives me the error

  Wrong number of arguments: #<subr indent-according-to-mode>, 1

as do a number of other sgml- commands.
 
Has anyone any insight into what might be going on?  Alternatively, has
anyone any other suggestions for dealing with Confluence with Emacs?

Cheers,

Loris

Footnotes:
[1]  https://addons.mozilla.org/en-US/firefox/addon/edit-with-emacs1/

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