Alphabet inc’s Google was sued on Tuesday in a proposed class action accusing the internet search company of illegally invading the privacy of millions of users by stealthily tracking their activities, even though their browsers were set in so-called “private” mode.

According to the complaint filed in the federal court in San Jose, California, Google gathers data through Google Analytics, Google Ad Manager and other applications and website plug-ins, including smartphone apps, regardless of whether users click on Google-supported ads.

The case is Brown et al v Google LLC et al, U.S. District Court, Northern District of California, No. 20-03664.

The lawsuit seeks at least $5 billion, accusing the Alphabet Inc unit of surreptitiously collecting information about what people view online and where they browse, despite their using what Google calls Incognito mode.

This helps Google learn about users’ friends, hobbies, favorite foods, shopping habits, and even the “most intimate and potentially embarrassing things” they search for online, the complaint said.

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The complaint stated that Google “cannot continue to engage in the covert and unauthorized data collection from virtually every American with a computer or phone”.

Jose Castaneda, a Google spokesman, said the Mountain View, California-based company will defend itself vigorously against the claims.

“As we clearly state each time you open a new incognito tab, websites might be able to collect information about your browsing activity,” he said.

The complaint said the proposed class likely includes “millions” of Google users who since June 1, 2016 browsed the internet in “private” mode.

It seeks at least $5,000 of damages per user for violations of federal wiretapping and California privacy laws.