Firefox 4 on Windows 7/XP is not allowing user interaction with form elements that contain HTML coding. For instance, a textarea element whose content includes h4 My Content /h4 br /

Question

On a Mac, Firefox 4 was also dysfunctional and the "enter" key immediately submitted the form instead of adding a line if the cursor was placed inside content to start with, but on Windows it seems impossible to get the cursor inside the textarea content at all.
The "view source" of the form textarea element plus the content that our user entered is pasted below:
<textarea name="content" cols="120" rows="50"><h4>SEARCH TOOL NOT WORKING</h4><br>
<h3>TRY FIRST</h3>
<P>Check for popup blockers; set for allow<br>
Mac users may want to use Firefox if Safari does not work and not a popup problem.</P>
<h3>COMMUNICATION FOR TROUBLESHOOTING </h3>
<p>Must provide the following information:<br>
Computer's operating system?<br>
Browser and version?<br>
On campus or off, if off how are you getting a Brown IP address?<br>
What in detail is wrong?<br>
What have you tried to overcome the problem?
</p>
<h3>IF ALL ELSE FAILS</h3>
<p>Contact CIS HELP - it may be your computer.
<p>A computer cluster in one of the libraries or CIT if the problem is not with the vendor. </p></textarea>

Answer 1

p.s. I realize that the user content is somewhat confusing, and your web page interprets the HTML tags instead of displaying them explicitly...
The user content begins after the <textarea> element and includes HTML headers, breaks, etc. Other HTML content inside form elements gave similar results. Thanks!