If you searched `does incognito stop websites from tracking me`, `why am I still tracked after private browsing`, or `why does a site still know me in incognito`, the short answer is no. Incognito mainly changes what your own browser saves later. It does not stop a live site from seeing an IP address, browser traits, account state, URL clues, and session behavior while you are there. That is why an incognito tab can feel fresh on your laptop while the site still has plenty of ways to recognize the visit itself.
Firefox's own support page is unusually direct about this distinction. Private browsing helps keep activity private from other people using the same browser profile or computer, but Mozilla also says it does not make you invisible online. That is the exact gap people hit when they open an incognito tab, revisit a shopping or travel page, and still feel like the site knows it is the same person coming back.
So what are sites still using after private browsing starts? The first layer is network and session context. A site can still see a live connection, a time pattern, referral information, and whether you quickly returned to the same high-intent flow. If you sign in, reuse the same account, or arrive through the same tagged link, private browsing did not erase those clues at all.
The W3C fingerprinting guidance explains the second layer. Fingerprinting is about identifying or re-identifying a browser through observable characteristics rather than only through classic cookies. The document is explicit that the privacy problem includes correlating visits across sessions, even after a user clears cookies or uses a VPN. That matters for shopping because a buyer can believe they started fresh while still carrying a recognizable browser shape into a high-intent checkout flow.
Mozilla's tracking-protection documentation points in the same direction from a product angle. Firefox separates private browsing from other protections like tracker blocking, Total Cookie Protection, fingerprinter blocking, and bounce-tracking defenses. That separation is a useful clue for ordinary users: a private tab is not the whole defense stack. It is one mode inside a broader privacy system because recognition can survive after local history is gone.
This is why suspicious shoppers pile up rituals instead of trusting one button. They open incognito windows, compare on another device, avoid signing in, clear cookies, or switch accounts before checkout. The behavior looks paranoid until you accept the basic point: the web has many ways to remember a browser, and private mode mainly changes what your own device remembers later.
For Cloak's topic cluster, the practical takeaway is simple. Private browsing is still worth using when you want to reduce local traces. It is just not enough if the goal is to make a shopping session harder to recognize, connect, and score. Real anti-profiling defense has to reduce browser fingerprinting, strip easy referral clues, and warn when a site starts building a pressure-rich profile around a buying decision.
So the honest answer is not `private tabs are useless`, and it is not `private tabs solve tracking`. The honest answer is that they help with one layer of privacy while leaving several others untouched. That is exactly why people searching this question are already looking for something stronger than browser hygiene alone.