Prefs: External HTML source default is C:\My Documents This does not make sense on Mac/Linux.

This is the Apprunner|Edit|Prefs|Composer presfs pane.

Re-assigning to Charley Manske. Please coordinate with Akkana and Kin for the best XP way to handle this.

What do I do to expose this bug?

there's a windows-style filename for the default in the said text field described above.

Charley: this is coming from modules/libpref/src/init/editor.js. We'd be better off removing those lines entirely than leaving them that way, since the current value is guaranteed not to work on two of the three platforms.

You should use nsIFileLocator in some way for this. Perhaps we need to add another enumerated value for the default location of new documents. I'm willing to act as guide on this.

"C:\My Documents" was removed from the default pref file. Will work on setting an appropriate default later

I've explained this elsewhere. Popup bugs belong to XPFE widget, not editor. They work better now anyway with hyatt's fixes to many of the popup widget bugs.

verified in 7/7 build.