Line 4 of the debugger installation instructions says

Make sure extension_dir is not ./. If it is, please set up extension_dir setting in php.ini accordingly. For example "c:/php4/extensions" or "/var/php/extensions" under unix.

I don't understand the phrase "please set up extension_dir setting in php.ini accordingly."

I'm on a Mac. Should I create the folder "/var/php/extensions" and then enter it as the value for extension_dir?

Thanks
Casey

you may have php extensions in any directory. Please follow php manual.
What I meant is that you should not leave extension_dir=./
It's the default value when nothing is specified in php.ini.

Hope I made it clear...