FBI May Be Hoarding a Firefox Zero-Day

An anonymous reader writes: Vice reported at the end of March that the FBI and the US DoJ are fighting tooth and nail to keep a Tor Browser exploit hidden from the public eye. Computer experts were quick to point out that this Tor Browser exploit, technically speaking, is a Firefox exploit, since Tor's browser is based on Firefox's ESR platform. Taking into account that Firefox follows open-source philosophy and reveals all security flaws reported, the effort which the FBI puts into restricting access too its exploit leads to only one conclusion, and that is that the FBI is hoarding a Firefox zero-day, currently unpatched in the browser's core, something it hopes to use once again.