I still have this issue while trying to edit Gravity Forms in Firefox. Was this ever resolved? See image. 
Hi There,
Please add the following code under functions.php file locates in your child theme:
function admin_style() {
?>
<style type="text/css">
img {
max-width: 100%;
height: auto;
}
</style>
<?php
}
add_action('admin_enqueue_scripts', 'admin_style');
Hope it helps 
Still there
… boo
Hi there,
Would you please kindly get back to us with the URL/User/Pass of your website using the Secure Note feature of the post?
As we do not have such a problem in our installation we want to check your case and see why this is happening on your environment and how we can help you resolve the issue.
Thank you.
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