If you write a HTML file that is not well-formed, such as tags are not properly nested as shown below.
<pre><td><select>....<select></td></pre>
You will find that the select field on the Firefox browser look like this
To solve the problem, we can simply make tags properly nested. That is, changing from
<pre><td><select>....<select></td></pre>
to
<pre><td><select>...</select></td></pre>
Now, we will have the select field look fine on Firefox browser
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