Select list options disappearing firefox

I am begginer in php programing and have a problem with select input box in firefox. When i click on dropdown arrow list options are visible but if i try to click one whole list disappears. I noticed that i can select option if i hold left mouse button all the time. Also i can select option using keyboard. Problem persists only in firefox browser.
Here is my code. Please help. If code is ok please state other possible problems(css, or something).

<?php include 'dbconn.cni'; echo ""; echo "
Find player and check his stats
"; $name= mysql_query("SELECT playername FROM players"); echo "
Choose player"; WHILE($res= mysql_fetch_assoc($name)) { echo "".$res['playername'].""; } echo "
"; echo""; echo""; echo""; echo""; ?>

PS. code is working on ‘pure’ php pages, problem shows in joomla html modules. I use sourcerer plugin to insert php and it is working in other similar modules with no problem.

Solved. Joomla styles made the error. I changed module tag to article and module style to html5 and everything works fine. Without that simple html select input without php was not working. Hope this will help someone.

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