Mozilla kills Firefox 32-bit support on Linux in version 145

Firefox 145 is now available for download, bringing some interesting changes like beefed-up privacy protections, a new way to handle PDFs, and the official end of an era for some Linux users.

This latest version of Firefox does not support 32-bit Linux systems. Firefox 144 was the last release for these machines, so Firefox 145 and all versions after it will require a 64-bit setup. Mozilla recommends upgrading to a 64-bit OS to get the latest features and security updates. But if you cannot do that, the Firefox Extended Support Release (ESR) version 140 will continue to receive security patches until September 2026.

To reduce fingerprinting, Firefox 145 introduces new privacy protections. Mozilla claims these defenses cut the percentage of users seen as unique by almost 50% when you are in Private Browsing or have Enhanced Tracking Protection set to "Strict".

In addition to that, you can now jot down notes directly in the browser's PDF viewer. This feature comes with a new comments sidebar where you add, edit, and delete your own comments.

If you are on Windows, you might see a new desktop launcher that replaces the existing desktop shortcut. The new launcher will launch Firefox if installed. Otherwise, it will prompt you to install it. Mozilla's logic is that this will help people who get a new computer and sync their old desktop via OneDrive, finding a Firefox shortcut but not the actual program.

Other changes include:

• You can now hover over a tab group's name to see a preview of the tabs inside it.
• The "Copy Link to Highlight" feature in the context menu lets you create a URL that directs someone to the specific text you had selected.
• Your saved passwords can now be accessed and managed directly from the sidebar.
• For developers, Firefox 145 adds support for the Atomics.waitAsync proposal in JavaScript and the Integrity-Policy HTTP header.
• Local translation models are now compressed using Zstandard, which reduces their download and storage size on your machine.

You can download Firefox 145 for Windows, macOS, and Linux.

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Posted Tuesday 11 November 2025 at 12:52 pm AEST (my time).

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