Tor Project releases second update (Tor Browser 8.5.3) for its privacy web-browser that patches the another Firefox zero-day vulnerability patched this week. Earlier this week, Mozilla released Firefox 67.0.3 and Firefox ESR 60.7.1 versions to patch a critical actively-exploited vulnerability. Android users have been advised to switch on “safer” or “safest” security levels in order to mitigate the issue until a patched app becomes available.
Source: https://thehackernews.com/2019/06/tor-browser-firefox-hack.html