contenteditable in table cells causes layout issues

Phenomenon

When a contenteditable region is inside a table cell (<td>), editing the content may cause layout issues in Firefox. The table may resize unexpectedly or the cell may overflow.

Reproduction example

1. Create a table with a contenteditable cell:

   <table>
     <tr>
       <td contenteditable>Editable content</td>
     </tr>
   </table>

2. Edit the content in the cell (add or remove text).
3. Observe the table layout.

Observed behavior

• In Firefox on Windows, editing content in table cells may cause layout issues.
• The table may resize unexpectedly.
• Cells may overflow or change size.
• The layout may become unstable.

Expected behavior

• Editing content in table cells should not cause layout issues.
• The table should maintain its structure.
• Cell sizes should remain stable during editing.