Link previews happen if you hold click on a link or choose it in the right click menu. By default it shows pretty much just the title of the page and a banner asking you to enable ai summaries.

It’s kinda annoying, but not because of the ai. And you can easily disable it

It has been working for a while, but it’s not recommended

Just make JSON5 the new official version and I would be ok

This is at least the third time, how do they even manage to fail that