How to uninstall mozilla-mplayer from Ubuntu
To uninstall just mozilla-mplayer package itself from Ubuntu execute on terminal:
sudo apt-get remove mozilla-mplayer
Uninstall mozilla-mplayer and it's dependent packages
To uninstall the mozilla-mplayer package and any other dependant package which are no longer needed on Ubuntu.
sudo apt-get autoremove mozilla-mplayer
If you also want to delete configuration and/or data files of mozilla-mplayer from Ubuntu then this will work:
sudo apt-get purge mozilla-mplayer
To delete configuration and/or data files of mozilla-mplayer and it's dependencies from Ubuntu then execute:
sudo apt-get autoremove --purge mozilla-mplayer
mozilla-mplayer package information
MPlayer-Plugin for Mozilla
mplayerplug-in is a Mozilla browser plugin to allow playing embedded movies on web pages using mplayer.
More information about apt-get remove
Advanced Package Tool, or APT, is a free software user interface that works with core libraries to handle the installation and removal of software on Debian, Ubuntu and other Linux distributions. APT simplifies the process of managing software on Unix-like computer systems by automating the retrieval, configuration and installation of software packages, either from precompiled files or by compiling source code.
apt-get is the command-line tool for handling packages, and may be considered the user's "back-end" to other tools using the APT library.
apt-get remove is identical to install except that packages are removed instead of installed. Note that removing a package leaves its configuration files on the system. If a plus sign is appended to the package name (with no intervening space), the identified package will be installed instead of removed.