It only works for users on Chrome versions 74–84. This method is outdated and should not be used, as it does not work on any current browser. After testing, it gave the same result as when not using Incognito mode:Īnd when using Incognito (or Private) mode:īoth show the answer No, which means this method cannot be used to detect Incognito mode on Firefox. This issue was never reported on Firefox before.
Testing this script on Chrome 89, without Incognito mode it gave the following result:Īnd the same result was given with Incognito mode: However, it no longer works after Chrome 84. It was reported that this method worked beginning with Chrome 74. If the user is in Incognito mode, the element answer should have the text Yes. You can test this by adding the following code to a script: If the estimated storage is less than 120 MB, then the user is in Incognito mode. This method estimates how much storage the website uses and how much is available for it to use. Method 2: Filesystem QuotasĪnother method to detect whether the user is in Incognito mode or not is the StorageManager API method estimate. Therefore, subjecting your visitors to a similar method would not be a good idea.
Compared to a visitor in Incognito mode and one not, it will likely require a lot of estimation.Īlso, the same behavior pertained after repeated testing on Chrome, but the result decreased significantly for both Incognito and non-Incognito modes, and the browser behaved oddly afterward. Testing this method on other major browsers like Firefox, Safari, and Opera will not work, as the requestFileSystem function is not supported.įurthermore, this method, even with Chrome and Edge is not optimal.
When the browser was in Incognito (or InPrivate on Edge):Īs Edge is now using Chromium for its engine, it can be assumed that as long as this method works on Chrome, it will also work on Edge. When testing this method on Edge, it produced the same behavior. This has been known since 2019 on Chrome 76, but it still works now on Chrome 89. Here’s a portion of the output on Chrome without Incognito mode:Īnd here’s a portion of the output on Chrome using Incognito mode:Īs you can see, the numbers dropped tremendously when the browser was using Incognito mode. This is where the array of timings in the onInit function will be displayed, which includes the time to write each file.
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