Had a customer who deleted an iFrame in a Joomla article. IFrames can be trouble-some in Joomla and the old JCE, but we have JCE Pro installed. I have sometimes switched the editor from JCE to NONE in the Global Configuration. This wasn’t the fix here. When I pasted the IFrame code into the article the iframe tag would be come “<i-frame”.

A Google search on “i-frame” and “Joomla” brought me to a page from RSJoomla. I had to remove some of the JavaScript protection on the post data. You can find this here (Components > RSFirewall! > Firewall Configuration > Active Scanner). It will look like this.

I hit the X so there were no protections other than being on. Here is a link to that article. They offer more suggestions, but only this one worked for me.

https://www.rsjoomla.com/support/documentation/rsfirewall-user-guide/frequently-asked-questions/scrambled-tags-iframe-becomes-i-frame.html?utm_source=readmoredoc&utm_medium=link&utm_campaign=rsfirewall-exception

I hope this helps someone else out there…