> Private window: Firefox Developer Edition clears your search and browsing history when you close all private windows. This doesn’t make you anonymous.

Emphasis mine. It's a better, simpler disclaimer than even the modified version that Google has started shipping post-settlement.

Firefox then includes a "learn more" link to https://support.mozilla.org/en-US/kb/common-myths-about-priv... which (imo) does a better job than Chrome's link at breaking down the myths. So Firefox takes really tangible steps to make sure that people understand what "incognito" browsing actually means.

The other difference is that Firefox actually does beef up anti-fingerpriting and anti-tracking protections by default to a greater degree than Chrome does if you're in a private browsing tab. The browser becomes stricter about blocking common tracking scripts and isolating data between domains. Firefox can't make you impossible to track during private browsing, but it does what it can, which is more than Chrome is willing to do, and most importantly, it makes sure that even if you're not tech-savvy you understand what the risks are. Firefox is not trying to be ambiguous or give you a false sense of security, but within its means it does try to make you as private as possible in those windows.

Their solution was to use Chrome.

Someone mentioned yesterday using the extension which clicks all advertisements. There is a long list of anti fingerprinting extensions.