[Webkit-unassigned] [Bug 266559] Safari periodically erasing LocalStorage and IndexedDB for all websites

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=266559

--- Comment #3 from Jeff Johnson <opendarwin at lapcatsoftware.com> ---
I found 100% reliable steps to reproduce, but they're complicated. It turns out that the issue seems to involve both the web inspector and a Safari content blocker.

Some background: I disabled "Prevent cross-site tracking" because of data loss due to the 7-day cap on script-writeable storage. However, I still wanted third-party cookie blocking, so I wrote a little Safari content blocker with one rule:

        "action": {
            "type": "block-cookies"
        },
        "trigger": {
            "load-type": ["third-party"],
            "url-filter": ".*"
        }

Ironically, this workaround is also causing data loss. I find it very frustrating that I can't use Safari without it automatically erasing data in some way.

Steps to reproduce:
1) Download and unzip the attached sample Xcode project StopTheCookies
2) Add the file DEVELOPMENT_TEAM.xcconfig to the folder with the contents DEVELOPMENT_TEAM = [YourTeamID]
3) Build and run the Xcode project
4) Open Safari Settings
4) Enable StopTheCookies in Extensions Settings, and make sure to Allow in Private Browsing
5) Disable Prevent cross-site tracking in Privacy Settings
6) Set Safari opens with: A new private window in General Settings
7) Open http://www.sharonminsuk.com/code/storage-test.html in a non-private window
8) Enter "testing" and press the Store it button
9) Quit Safari
10) Open Safari
11) Open https://www.cnn.com in the private window
12) Open a new non-private window
13) Open http://www.sharonminsuk.com/code/storage-test.html in the non-private window
14) Close the non-private window
15) Open the web inspector in the CNN tab
16) Close the web inspector
17) Close the CNN private window
18) Open a new non-private window
19) Open http://www.sharonminsuk.com/code/storage-test.html in the non-private window

Expected results: Local storage: "testing"

Actual results: Local storage: empty

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