I don’t understand what tab groups are from the description in the article. How are they different from keeping groups of tabs in separate browser windows? Is this just something I don’t understand because I don’t keep tabs open forever?

Do you know if they have any plan to stop requiring invites? I’ve been interested for many years, but the invite system rubs me the wrong way.

If your bank doesn’t offer virtual credit cards (or they’re a pain to use) and you don’t want to sign up with another service, then yeah - PayPal is safer to give than your credit card number.