A more precise comparison would be always-on incognito plus Disconnect[1]. So, it uses a dumb tracker block list like it could also be enforced by uBlock Origin, and the list that Firefox uses is the list that the Disconnect devs put together.
Then, again, it also depends on which browser's incognito mode you're talking about. Firefox's Private Browsing comes with Tracking Protection, which uses this same block list. So, privacy-wise this is actually identical to Firefox's Private Browsing mode.
A more precise comparison would be always-on incognito plus Disconnect[1]. So, it uses a dumb tracker block list like it could also be enforced by uBlock Origin, and the list that Firefox uses is the list that the Disconnect devs put together.
Then, again, it also depends on which browser's incognito mode you're talking about. Firefox's Private Browsing comes with Tracking Protection, which uses this same block list. So, privacy-wise this is actually identical to Firefox's Private Browsing mode.
[1]: https://addons.mozilla.org/en-US/firefox/addon/disconnect/