Hello kanduvisla,
In ckeditor/assets/filebrowser.js, line 8:
Symphony.WEBSITE = window.location.toString().match(/^(.+?)\/symphony/)[1];
you use "lazy plus", I mean ".+?" regexp.
I've put up new environment recently, and URL to my new project's symphony administration panel looked this way:
http://127.0.0.1/symphony/PROJECT/symphony/
Unfortunately, your way of extracting Symphony.WEBSITE gives only http://127.0.0.1, because regexp stops after first symphony string. If you use "greedy plus" (only .+, without ?), it would properly give http://127.0.0.1/symphony/PROJECT and this makes file browser work properly.
It took me quite a bit to look this bug up! I hope that my little contribution will help somebody in the future ;)
cheers