iFrame allowed in Add-On?

Hi, I want to develop an add-on that inserts an iframe into the content and load in this iframe another website.
is this allowed?
thanks for help

As long as you are not doing anything illegal, it should be ok.

However, many pages doesn’t allow 3rd party content to be loaded in the iframe. So you will need to load your extension page into the iframe first and then in your extension page create new iframe with the 3rd party website. BUT this website may again have security headers that will prevent it from being loaded into iframe so you may have to remove those. AND further more, some pages have javascript checks that will detect that the page is being loaded in the iframe and won’t load at all. But most pages should be fine.