Problem in Mozilla FireFox with CSS Layout

I have a Table in my application. Table id is "joining_resumes_table". In that table i have 4 columns like this below

 <table id="joining_resumes_table">
      <tr>
        <th class="resume_name">        Name         </th>
        <th class="resume_requirement"> Requirement  </th>
        <th class="resume_joiningdate"> Joining Date </th>
        <th class="hidden_by_default">  Accept Date  </th>
      </tr> 
 <tr>
  <td class = "resume_name"> .... </td>
  <td class = "resume_requirement"> .... </td>
  <td class = "resume_joiningdate"> .....</td>

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