The article says it works against Chrome, Safari, and Edge. Brave fixed it. Firefox wasn't vulnerable. The article says Firefox wasn't vulnerable because of a

The article says it works against Chrome, Safari, and Edge. Brave fixed it. Firefox wasn't vulnerable. The article says Firefox wasn't vulnerable because of a bug. But it might have been intentional.[1] The researchers opened a bug report saying Firefox should implement the vulnerability a year ago.[2] They said they didn't realize it was a vulnerability at the time and not warning Mozilla later was an oversight.[3] [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1618257#c9 https://bugzilla.mozilla.org/show_bug.cgi?id=1618257#c9 [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1618257 https://bugzilla.mozilla.org/show_bug.cgi?id=1618257 [3] https://arstechnica.com/information-technology/2021/02/new-browser-tracking-hack-works-even-when-you-flush-caches-or-go-incognito/?comments=1&post=39678939#comment-39678939 https://arstechnica.com/information-technology/2021/02/new-b...