> this is not a vulnerability in nightly, it is a vulnerability in Firefox Beta That's usually a sign that we've fixed. Fixes in nightly later get tested in Beta, and finally into the main version. I agree with Kevin (comment 4) that this looks like bug 1739934, which was fixed in the Firefox 95 we released a couple of weeks ago. The fix came late in the release cycle so it missed most of the beta period. Advisory here: https://www.mozilla.org/en-US/security/advisories/mfsa2021-52/#0
Bug 1745842 Comment 7 Edit History
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> this is not a vulnerability in nightly, it is a vulnerability in Firefox Beta That's usually a sign that we've fixed that bug. Fixes in nightly later get tested in Beta, and finally into the main version. I agree with Kevin (comment 4) that this looks like bug 1739934, which was fixed in the Firefox 95 we released a couple of weeks ago. The fix came late in the release cycle so it missed most of the beta period. Advisory here: https://www.mozilla.org/en-US/security/advisories/mfsa2021-52/#0