I like the very simple API to FirePHP and find it very useful for debugging WordPress plugins and themes. There are a few other plugins out there that integrate FirePHP, notable WP-FirePHP and WP-Logger, but both add complexity that I don’t want to have to deal with for a quick debugging task.
It wouldn’t be that hard to install the FirePHP core and add the includes to wp-config.php, and that’s what I generally do on sites that I control, but having this plugin in the Wrodpress.org/extend directory means that I’ll be able to install it on the fly for a blog that someone hasn’t given me shell or ftp access to.
Plans
I don’t think I’ll do a whole lot more with this, since I want to keep it pretty simple, but I plan to make sure the plugin loads first (see wp-logger) and perhaps add a simple options screen. Might also add PHP4 support, but probably not.