(In reply to Honza Bambas (:mayhemer) from comment #4) > Actually - this is not a duplicate, because cache is isolated properly between private and regular windows (the concern of this bug). FWIW this test case confused the heck out of me, until I realized that it is constructed in a way to make testing in a private and non-private window on the same machine completely useless, because of [this code](https://github.com/lucb1e/cookielesscookies/blob/a23a2c8163d91063f08ca38e530b284839933d06/index.php#L15) which computes and assigns the *same* ETag number every time when fetching http://lucb1e.com/rp/cookielesscookies/tracker.jpg. This test case must be _ignored_ for the purposes of assessing whether a browser correctly partitions the private and non-private cache away from each other.
Bug 1564457 Comment 5 Edit History
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(In reply to Honza Bambas (:mayhemer) from comment #4) > Actually - this is not a duplicate, because cache is isolated properly between private and regular windows (the concern of this bug). FWIW this test case confused the heck out of me, until I realized that it is constructed in a way to make testing in a private and non-private window on the same machine completely useless, because of [this code](https://github.com/lucb1e/cookielesscookies/blob/a23a2c8163d91063f08ca38e530b284839933d06/index.php#L15) which computes and assigns the *same* ETag number (based on the UA string and IP address) every time when fetching http://lucb1e.com/rp/cookielesscookies/tracker.jpg. This test case must be _ignored_ for the purposes of assessing whether a browser correctly partitions the private and non-private cache away from each other.