Firefox is not the only widely used engine not supporting `-webkit-text-security`, and it seems to be in use in the wild to conceal password fields, as per this [webcompat.com report](https://github.com/webcompat/web-bugs/issues/114591). Chrome Platform Status [implies that its usage](https://chromestatus.com/metrics/css/timeline/popularity/322) is low (~0.3%), but slowly growing.
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Firefox is the only widely used engine not supporting `-webkit-text-security`, and it seems to be in use in the wild to conceal password fields, as per this [webcompat.com report](https://github.com/webcompat/web-bugs/issues/114591). Chrome Platform Status [implies that its usage](https://chromestatus.com/metrics/css/timeline/popularity/322) is low (~0.3%), but slowly growing.