Firefox 140 ESR Web Browser Is Now Available for Download, This Is What’s New

posted by Marius Nestor on Jun 23, 2025,
updated Jun 25, 2025

Highlights of Firefox 140 include a new Unload Tab feature that lets you unload tabs by right-clicking on a tab (or multiple selected tabs) to reduce Firefox’s memory and CPU usage, support for adding custom search engines in Search settings, and support for keeping more or fewer pinned vertical tabs in view.

For Android users, Firefox 140 adds a “Select All” option for bookmarks. Of course, as you have noticed, Firefox 140 is an ESR (Extended Support Release) version, which means that it will be supported for the next couple of years with security fixes through regular point releases.

Read on

Linuxiac:

• Firefox 140 Now Available for Download, Here’s What’s New

  Almost a month after releasing version 139, Mozilla has launched Firefox 140, the latest update to its popular open-source web browser, now available for download.

  One of the most practical additions is the ability to unload tabs manually. Users can now right-click on any tab (or multiple selected tabs) and choose “Unload Tab” to free up memory and CPU resources without losing their place.

  For vertical tab users, the latest version allows adjusting the size of the pinned tabs section by simply dragging the divider, giving more (or less) space to frequently used tabs.

UbuntuHandbook:

• Firefox 140.0 is Available with Custom Search Engine | UbuntuHandbook

  The 140.0 release of Firefox web browser is available to download after 4 weeks of development and beta testing.

  In addition to Google, Bing, DuckDuckGo, and Wikipedia, the new release introduced custom search engine support. User now can either right-click search field of a supported website and select Add Search Engine, or go to “Settings -> Search” to add search engine with custom name, URL, and optional keyword.

OMG Ubuntu:

• Firefox 140 Brings Tab Unload, Custom Search & New ESR - OMG! Ubuntu

  Not that is just a regular monthly update. Firefox 140 is also the new Extended Support Release (ESR), meaning those who opt for the slower, more stable upgrade pace ESR provides will see a significant uplift in features available to them.

  For monthly folks, there are appreciable improvements to look for, including tweaks to the vertical tabs experience, an easier way to free up memory from background tabs, more flexibility for search engines, and a dampening down of ‘visual noise’ on the New Tab page.

  To take a closer look at this month’s changes, read on!

A couple more:

• Mozilla rolls out Firefox 140 ESR with fresh features

  There are some handy fresh features in this version. You can right-click on a tab and unload it, meaning that its contents are cleared from memory, to be reloaded the next time you switch to it. And if you use vertical tabs, you can resize the pinned-tabs area at the top of the tab bar, which could be handy. You can optionally hide the extensions button from the toolbar.

• Firefox 140.0 released

  Version 140.0 of the Firefox browser has been released. Changes include more control over vertical tabs, a dialog to add custom search engines, improvements to translation performance, and more.

On Firefox WebDriver Newsletter 140:

• Firefox Developer Experience: Firefox WebDriver Newsletter 140

  Firefox WebDriver Newsletter 140

  WebDriver is a remote control interface that enables introspection and control of user agents. As such it can help developers to verify that their websites are working and performing well with all major browsers. The protocol is standardized by the W3C and consists of two separate specifications: WebDriver classic (HTTP) and the new WebDriver BiDi (Bi-Directional).

  This newsletter gives an overview of the work we’ve done as part of the Firefox 140 release cycle.