Comment 10 for bug 167936

Guys!
Why not submit your voice to "This bug affects you" of lauchpad on top of this page!

BTW, I surveyed other opensource project with the same issue.
Kompozer is one of open source HTML editor supporing external CSS file.
http://sourceforge.net/projects/kompozer/

Kompozer supports
- reading external css files.
- editing external css files if the file can be updated

Thus Kompozer partially supports "2) local css saving" of my #5 comment.

CSS editing function is provided as "CasCadeS" extension (built-in),
and its source can be found from here.
http://kompozer.svn.sourceforge.net/viewvc/kompozer/trunk/mozilla/extensions/editor/cascades/resources/content/

Hope this help.