Moving the text cursor inside form elements causes js-error and breaks source-mode

[janpe]

Moving the text cursor inside a submit, textarea or such by using the arrow keys causes an error shown in Firebug: "Error: Permission denied to access property 'nodeType'" in ckeditor.js on line 13.

This will also result in the Source-button not working so that you cannot enter the source-mode. The button will work again after moving the cursor out of that place.

Here's a sample source code with which you can easily reproduce the bug by moving the cursor with your arrow keys.

Also tested this on the nightly build.

"<h1>Form</h1><p><input id="upload" name="upload" type="file" /><br /><input id="submitForm" name="submitForm" type="submit" value="Submit" /></p>"

I am using Win7 Pro and Firefox 16.0.2

[janpe]

Cursor inside the submit input and firebug showing the error