Communication between HTML and your extension - Archive of obsolete content
with a lot of help from irc://irc.mozilla.org#js and irc://irc.mozilla.org#extdev i was able to get it running pretty well, but i still would rather have the client less responsible for pinging the extension to "look" for what is on the page.

Toolbars - Archive of obsolete content
mailing list newsgroup rss feed #extdev irc channel mozillazine forum about:addons newsletter mozilla's web-tech blog mozdev project owners planet mozilla other community links...

Community - Extensions
mozillazine extensions & themes forum #extdev channel on moznet irc network — extension development questions #addons channel on moznet irc network — questions about http://addons.mozilla.org mozdev project owners mailing list mozillazine knowledge base allyourideas — ideas for extensions ((really needs a unique captcha)) babelzilla — a community for developers and translators of extension for mozilla applications ...