Thank you for the reply Bundyo. I just executed the command you recommended and this came back:

(Reading database ... 17968 files and directories currently installed.)
Removing mplayerplug-in ...
chown: /home/user/.mozilla/microb/lock: No such file or directory
chown: /home/user/.mozilla/microb/lock: No such file or directory
chown: /home/user/.mplayer/: No such file or directory
chown: /home/user/.mplayer/*: No such file or directory
dpkg: error processing mplayerplug-in (--remove):
subprocess post-removal script returned error exit status 1
Errors were encountered while processing:
mplayerplug-in

Thanks again for your time.