Did you ever wonder how to get rid of these evil pseudo cells selection / borders in your html tables in FireFox?
 
The solution is:
    
<table border="1" style="-moz-user-select: none;">
        <tr>
           <td>Cell</td>
           <td>Cell</td>
        </tr>
      ... 
however... if you have an INPUT elements inside the cells you will definitely loose the selection inside the INPUT. You can try this example:
  
  <table border="1" style="-moz-user-select: none;">         <tr>            <td<input type="text" /></td>            <td>Cell</td>         </tr>       ...
 
So the question is: 
How to remove the cell selection borders and keep the selection in INPUT elements?  
... and the answer is ...: 
-moz-user-select: -moz-none;