Security is debatable. Sand boxing was just introduced. Customizable maybe, but between the australis, xul deprecation, and the limited theming API I don't thin

Security is debatable. Sand boxing was just introduced. Customizable maybe, but between the australis, xul deprecation, and the limited theming API I don't think Mozilla really cares. Also for a open source browser. Are you aware the is chromium? Or hell any number of electron based web browsers (which is also chromium). Edit and loss of configurability is not the issue. Loss of Functionality is.