Mozilla plans to release Firefox 140.0 to the Stable channel on June 24th, 2025. The new version of Firefox includes several usability improvements and new features, such as a new option to unload tabs to free up memory, improved vertical tab pinned tabs, faster full-page translations, and much more.
All other channels and versions of Firefox will also be updated around the same time. The Firefox ESR (Extended Support Release) versions are updated to 115.25.0, 128.12 ESR and 140.0 ESR respectively. Firefox 140 ESR is a new base for the extended support releases and it will replace 128.x soon. Firefox 115.25.0 ESR is still maintained for earlier operating system versions.
Last but not least, the development channels Firefox Beta, Firefox Developer Edition, and Firefox Nightly also move up a version to Firefox 141 and Firefox 142 respectively.
You can check out my review of Firefox 139 here.
Tab Unload
The new feature is designed to free up memory while Firefox is running. Just right-click on any open tab in the Firefox web browser and select the new "unload tab" option from the context menu.
The tab remains visible but Firefox unloads it to free up memory. Unloaded tabs show up with gray icons to indicate that they are sleeping and not active.
The feature can be useful in some situations, for instance when the device is low on memory or when a website is "misbehaving" and consuming way too much memory or CPU.
Simpler to add custom search engines
Adding a custom search engine is now much simpler in Firefox. All you have to do is right-click on a search field and select the "add search engine context menu option and then the "add search engine" button in the dialog that pops up. You can add a keyword for faster access to the search engine optionally as well here.
Full-page translations speed up
Firefox supports privacy-friendly local translations for some time now. The translations do not require an Internet connection for translating content. The only time an Internet connection is required when Firefox downloads a language pack for the language that you want it to support.
Firefox 140 introduces a change for translated full-page content. Firefox used to translate the entire page by default immediately, when you selected the option. Now, Firefox will focus on the visible text, which, according to Mozilla, should speed up the translation process significantly.
Developer changes
Enterprise changes
Security updates / fixes
Mozilla fixed 13 security related issues in Firefox 140.0. The severity rating is high, but Mozilla makes no mention of exploits in the wild. Still, it is recommended to upgrade Firefox asap to block potential attacks.
Most non-managed versions of the Firefox web browser are updated automatically. The browsers check automatically for updates and will install new versions. These checks do not happen in real-time and some users may prefer to download and install the updates immediately.
This can be done in desktop versions of the Firefox web browser by selecting Menu > Help > About Firefox.
Manual downloads are also provided on Mozilla's official website.
Outlook
Firefox 141 will be released on July 22, 2025. The same is true for Firefox 140.1 and Firefox 128.13. Linux users can look forward to a big improvement in the release. Firefox will use less memory and no longer require a restart after an update has been applied by a package manager.
Additional information / resources
Closing Words
Mozilla continues to add usability improvements to Firefox. Some add features that other browsers have supported for a long time, others, like Firefox's privacy-friendly translation feature, are quite unique and standout features.
Now You: have you tried the new Firefox release already? Let us know in the comment section below.
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