Some years ago I found Mcafee Enterprise doing something similar, where it added a unique ID to the user agent string on Firefox. It didn't inject it tlat runti

Some years ago I found Mcafee Enterprise doing something similar, where it added a unique ID to the user agent string on Firefox. It didn't inject it tlat runtime though, it actually modified your Firefox profile files to set it. I presume this wouldn't allow tracking in private browsing mode (I guess Firefox doesn't use the standard user agent), but still not good.