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What’s in the latest Firefox update? 90 unblocks Facebook sign-ins, updates in background


Mozilla on Tuesday bumped Firefox to version 90, launching an enhanced version of its anti-tracking technology that allows exceptions for logging in to sites with the user’s Facebook credentials.

The outfit’s engineers also patched nine vulnerabilities, five tagged as “High,” Firefox’s second-most-serious label. Two of the nine were found only in the Android edition of the browser, but none were marked “Critical,” the most dire flaw category.

Firefox 90 can be downloaded for Windows, macOS, and Linux from Mozilla’s site. Because Firefox updates in the background, most users can relaunch the browser to install the latest version. To manually update on Windows, pull up the menu under the three horizontal bars at the upper right, then click the help icon (the question mark within a circle). Choose “About Firefox.” (On macOS, “About Firefox” can be found under the “Firefox” menu.) The resulting page or pop-up shows that the browser is already up to date or displays the upgrade process.

(Note: Firefox’s new background update process, which Mozilla showcased in April, has been enabled in version 90 — but only on Windows. As is usual, only a subset of users will have this feature switched on to start.)

Unblocks Facebook log-ins

For June’s jump to version 89, Mozilla delivered an extensively-tweaked user interface (UI) previously known by the code name “Proton.” Mozilla touted the changes as a significant look and feel overhaul, and said it was “designed to win you back” to the open-source browser, which has continued to slump in popularity.

Not surprisingly after a major effort upgrade, the follow-up, Firefox 90, was relatively sparse on new and shiny features meant to tempt users to abandon rivals.

One of the big-ticket items in Firefox 90 — as measured by Mozilla’s own publicity efforts — was a rather minor enhancement of the browser’s anti-tracking defenses. Previously, anti-tracking automatically blocked log-in scripts — those triggered when a user clicks on, say, “Google” or “Facebook” options to register or sign-in to a site.

In Firefox 90, anti-tracking — dubbed SmartBlock — “reacts by quickly unblocking the Facebook login script just in time for the sign-in to proceed smoothly,” according to Thomas Wisniewski and Arthur Edelstein, web compatibility engineer and senior product manager for privacy and security, respectively. In other words, the usual block is temporarily lifted long enough for authentication, at which point the block resumes so that a user is protected while navigating to other websites.

The new behavior occurs when users are within a Private Window.

It seems odd that Mozilla, which prides itself on its privacy stance, and more specifically, with blocking trackers, has decided to initiate the feature with Facebook, whose privacy and tracking reputations are, to put it kindly, lamentable.

Background updates, but only for Windows

Background updates, which Mozilla broached in April, finally arrived in Firefox 90 for Windows users.

Prior to version 90, Firefox updated itself only when the browser was running. Much like rivals, including Chrome and Edge, Firefox looked for pending updates and upgrades when it was launched, then downloaded them in the background. However, the update or upgrade was not actually installed until the browser was restarted. Thus, users who left Firefox open indefinitely or spent weeks between system reboots might well be running an insecure version, even though a patched edition was available and already on their machine.