There are many different reasons why webmasters want to block users from using incognito browsing.
For example, some users use incognito browsing to bypass content payments. In addition, the current anonymous browsing (private browsing) features in most browsers also come with anti-tracking features that prevent websites from tracking and generating traffic from their traffic.
Both of the above issues that appear with the use of private browsing result in immediate financial losses on the websites.
In early 2019, the Google decided to stop these scripts. THE Chrome 76, released in July 2019, included an update that prevented websites from using the FileSystem API to detect when a user was using their normal browsing mode Chrome or its anonymous browsing function.
Before him Chrome of version 76, the FileSystem API was simply not available in incognito mode, and webmasters could simply send a query to this API to find out if a user was using incognito mode. With the Chrome 76, h Google enabled the FileSystem API for incognito browsing, rendering previous crawl scripts completely useless. However, this update contained errors.
OR Google did not fully enable the FileSystem API, but set a limit on the size of storage space that anonymous browsers could access, at 120 MB.
It took developers less than a week after its release Chrome 76 to find out what was going on and develop scripts that explored the FileSystem API to determine the amount of storage space a site could access. This way they could indirectly detect whether a user was using incognito mode or not.
Answering a question from Bleeping Computer, the Google promised in August 2019 to fix the bypass and block anonymous browsing.
However, nine months later, it is still possible to detect anonymous browsing status in Chrome and all other Chromium-based browsers, such as Edge, Opera, Vivaldi, and Brave.
We do not know at this time when a patch will be released to fix the issue, but Google may be more interested than ever in resolving this issue.
On Tuesday, the company was charged that it secretly monitored users, even in incognito mode.
Note that blocking incognito browsing will not prevent advertisers from tracking users, as both administrators and advertisers will continue to see information such as IP addresses and other traffic data. However, it will help her Google to gain some users, who are interested in their privacy.