Mozilla switched to a Chrome-like release schedule years back and has kept up a consistent release cycle ever since. It doesn’t usually deviate unless there’s a serious issue. Well, there’s a serious issue. Mozilla advises all Firefox users to update to the latest version of the browser as soon as possible. The company has just become aware of a zero-day exploit affecting Firefox, meaning there are nefarious internet forces actively using it.
The latest build and the only one that will protect you from the bug is v67.0.3. You can see which version you’re running by opening the menu, clicking Help, and selecting “About Firefox.” The browser should prompt users to update, but you can do so manually if your browser is not on the latest build — just type “update” in the search bar.
Mozilla has specifically avoided providing extensive details of the flaw. It only says it knows there are active attacks in the wild, so it probably wants to get users updated first. Otherwise, it could make things even worse.
Firefox has managed to avoid frequent emergency updates. The last one was in 2016 when it patched a zero-day exploit that could de-anonymize users of the Tor network.