Security News > 2022 > July > Mild monthly security update from Firefox – but update anyway
There's the latest-and-greatest version, currently 103, which has all the latest features and relevant security fixes.
There's the Extended Support Release flavour, which synchs up with the features in the latest version every few months, but in between gets security updates only, thus bringing in new features only after they've been available to try out in the mainstream version for some time.
As you can imagine, sysadmins and IT teams who support Firefox at work often like ESRs because it means they don't have to foist new features on their own users without good warning.
There are almost always at least a few bugs fixed in the mainstream Firefox version that don't appear in the ESR, and thus can't be fixed there, because the bugs are new, introduced in the new code added to support the new features.
Mozilla retains two ESR versions, so that you can try the previous and the current ESR versions at the same time before making the switch, thus never needing to use the cutting-edge version our your production network at all.
As usual, go to Help > About Firefox and see whether the popup box tells you Firefox is up to date or offers you a clickable button labelled.