I must be blanking, because I can't remember any major shuffles on the (Linux) desktop. Either you've noticed and I haven't, or it's stripped out / disabled by default by the maintainers.

Do you mind elaborating on what I've missed?

I’m using macOS.

The menu item often appears after the rest of the context menu. Since it appears in the middle of the menu it causes a bunch of items to shift and and leads to misclicks.

It would be less of an annoyance if it appeared straightaway but was disabled, and then enabled once it was ready to use, because then it would avoid moving already visible UI elements.

In general I don’t like visible UI elements to change position unless it’s in response to a direct user action (e.g., expanding or collapsing a group). It’s the sort of thing that trashy news website do to ensure they get at least some ad clicks, and it always feels janky and causes frustration.

Thank you. Mine appears fast enough that I hadn't actually noticed - seemingly by the time I release my right-click button. This is on (what I consider) obscenely powerful hardware for a web browser though: a 5600X, 64Gb RAM, and a hardwired connection with geek-level hardware all the way up the chain. Basically the best possible scenario, and it's still noticably slower than the rest of the context menu now that I look for it.

I just tried right clicking on Firefox and got 15 lines of text of which one is "Ask an AI chatbot". Is that it?

Yeah, that’s it, but that item often appears after the rest of the menu for me, causing items below it to shift down one place, leading to misclicks.

I don’t mind that the item exists: I mind that it makes other menu items move after they’ve already appeared.

I just checked and if you mouse over it it has an option "remove ai chatbot" which works immediately, so at least there's that.