Mozilla informs all users they need to update their Firefox browser apps as soon as possible, revealing actively exploited zero-day bugs in the process.

This is true for Firefox on all platforms, including macOS, Linux and Windows. Note: your tabs will never be lost when you restart as long as you check the correct settings: More > Settings ...

Update Chrome and Firefox now to patch these critical security flaws The latest updates for both browsers squash several high-severity security bugs. Here's how to grab them.