You can uninstall or removes an installed beid-mozilla-plugin package itself from Ubuntu 12.04 LTS (Precise Pangolin) through the terminal,
$ sudo apt-get remove beid-mozilla-plugin
If you would like to remove beid-mozilla-plugin and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove beid-mozilla-plugin
If you use with purge options to beid-mozilla-plugin package all the configuration and dependent packages will be removed.
$ sudo apt-get purge beid-mozilla-plugin
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove beid-mozilla-plugin