Can't edit .yml files?

I'm hoping someone may be able to help me with this. Please help!

For some reason, I can't edit the .yml files of my plugins? I used to be able to edit my config files and such, but no longer. I'm not sure why this is happening. I use Firefox and have it updated. Can someone please help? I just installed bPermissions and uninstalled PEX, so none of my permissions are in play and it's really messing up my server!'

Thank you

Hmm. Okay, it worked on Chrome. I couldn't access the editor, no. This is what it looks like on firefox.

[Blocked Image: http://puu.sh/k3CtL/a612866e46.png]
It seems to have fixed itself after clearing all my cache and cookies. That's weird.

Oh, well. It was a simple fix and for that I am thankful.