Yeah I just browse with a profile that deletes all cookies and history when I close the browser. Then just accept or dismiss all those stupid cookie consent popups.

I've seen many of consent forms mention tracking beyond cookies and cross-devices.

Are you sure that by accepting you aren't just accepting legally to continue to be tracked with all other means?

If true, then deleting cookies only cause them to ask again next time, but you're still fully tracked.

See https://www.kompyte.com/blog/5-ways-to-identify-your-users-w... (just found it) for examples of tracking without cookies.

They don't have it on mobile yet, though you can use the "I don't care about cookies" UBlock filterlist

More like "they had, but decided to remove". Firefox on Android used to support any extensions, but they cut that down. You can still get the functionality in browsers like Icecatmobile, though.

If you mean the old XUL extensions with zero security? I think that transition was worth losing some extensions due to the more strict sandboxing.