[johnh-hn]

If the checkbox you're referring to is the "Use AI to suggest tabs and a name for tab groups" one, then I can't see what setting it changes. It's not the browser.ml.enable flag. I tried unchecking it, restarting the browser, and that flag was unaffected. This is in version 144.0.2.

Searching for "AI" shows one other setting: "Quickly access bookmarks, tabs from your phone, AI chatbots, and more without leaving your main view." But I'd already disabled that apparently. Despite that, there are plenty of flags that were enabled mentioned in the article.