custom dataprocessor - issue with <br /> firefox

http://www.51aspx.com/CodeFile/YetAnotherForum195/YetAnotherForum.NET/editors/ckeditor/plugins/bbcode/plugin.js.html http://text.md/ckeditor-bbcode-plugin/

<p>line 1</p>
<p>line 2 E<br />
line 3 SE</p>
<p>line 4 E</p>

<p>line 1<br />
</p>
<p>line 2 E<br />
line 3 SE<br />
</p>
<p>line 4 E<br />
</p>