Eventually some very helpful folks on #extdev pointed me to Ted Mielczarek's excellent Extension Wizard. Give it some details about your extension (its name and version, your name, and a couple things you might want like a toolbar button, a prefs panel and a context menu) and it generates a zipped directory containing a bare bones extension, even including niceties like internationalized strings.
Even better, your new extension skeleton includes a readme that tells you how to leave the extension expanded while you work on it. That's quite a bit easier than building the XPI file and installing it each time.
So kitfox has a 0.3 version (in the unlikely event that anybody besides me wants it).
There's a project called fizzypop to develop and extend useful Mozilla dev tools like the Extension Wizard ... watch that space for more details.
[ 21:12 Jul 04, 2008 More tech/web | permalink to this entry | ]