After further testing with Andrei, it appears that the problem is only reproducible on machines that have used the Force Attribution method, it appears that a file is written and will persist throughout profile switches and fx versions, but it will not affect normal users, if anyone thinks it should be fixed I can log a new bug with low severity. Regarding the validation of the bug: As I previously stated, testing has been carried out on the following platforms: 66.0b7, 66.0b8 and 67.0a1 using Windows 10 x64 and macOS 10.13.6 to make sure the switch is as mentioned in previous comments: off on Beta 7, on for Beta 8 and Nightly. As no other major issues were identified and the switch works as expected, I will mark these versions as verified.
Bug 1524028 Comment 19 Edit History
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After further testing with Andrei, it appears that the problem is only reproducible on machines that have used the Force Attribution method, a file is written and will persist throughout profile switches and fx versions, but it will not affect normal users, if anyone thinks it should be fixed I can log a new bug with low severity. Regarding the validation of the bug: As I previously stated, testing has been carried out on the following platforms: 66.0b7, 66.0b8 and 67.0a1 using Windows 10 x64 and macOS 10.13.6 to make sure the switch is as mentioned in previous comments: off on Beta 7, on for Beta 8 and Nightly. As no other major issues were identified and the switch works as expected, I will mark these versions as verified.