The arrival of Firefox 150 and its 150.0.1 revision for Windows marks one of the most significant leaps forward for Mozilla's browser in quite some time. We're not just talking about a handful of visual tweaks: the combination of new features, security adjustments, and performance improvements is aimed squarely at everyday users, whether browsing for leisure or working with dozens of tabs open.
This version brings together several lines of work that Mozilla has been developing for some time: a much more useful Split View , a PDF editor that is starting to resemble a standalone tool, stricter privacy controls on the local network, a revamped profile system in Windows, and dozens of internal fixes, including critical vulnerabilities that have been cleaned up even with the help of artificial intelligence.
Firefox 150 vs 150.0.1: What really changes
Mozilla has opted for a two-stage release: Firefox 150 arrives first as the major update, and shortly after, Firefox 150.0.1 appears as a maintenance version. On paper, 150.0.1 seems like a minor update, but in practice, it irons out several annoying bugs and closes some significant security vulnerabilities.
This update addresses issues with dropdown menus that were displaying all items incorrectly, which could break complex web interfaces. It also fixes zoom bugs on both Windows and macOS that caused unusual behavior when zooming in or out.
Another important fix relates to location permissions . Previously, some users encountered repeated request windows, even after granting or denying permission. Version 150.0.1 stabilizes this behavior, ensuring the browser truly respects the user's choice.
Version 150.0.1 also improves compatibility with certain web services when using security software like Bitdefender , which in some cases interfered with pages loading correctly. Additionally, specific scenarios where sites like Facebook might not load properly have been fixed.
In terms of security, this additional update includes fixes for several memory vulnerabilities , with five flaws marked as high severity and one categorized as critical. It doesn't introduce major visible changes, but it clearly strengthens the browser's stability and security.
Split view is much more powerful for working with multiple tabs.
One of the standout features of Firefox 150 is the evolution of Split View. This feature existed in previous versions, but it was quite limited: you had to choose tabs from an impractical menu, and it felt incomplete.
Now, the experience changes completely because you can open any link directly in split view. Simply right-click on the link and select the option equivalent to "Open link in split view" to load the page alongside the current tab in the same browser window.
Furthermore, when configuring split view, you can browse through open tabs to select which one to display in the secondary panel. This is extremely helpful when working with many active tabs, as you no longer need to go through them one by one to find the right one.
Mozilla has also added a very practical feature: the "Invert Tabs" option , available in the context menu of split view. With a single click, you can swap the positions of the two tabs (left and right) without closing anything or reconfiguring the settings.
Although this split view doesn't yet reach the level of the more advanced mosaic modes of some competitors, it's clear that Mozilla is paying attention and that the feature is already mature enough to be worth using on a daily basis, especially on large screens.
Tab management: sharing links and controlling grouping
Along with the improved split view, Firefox 150 includes very useful tweaks to advanced tab management . One of the most striking is the ability to share multiple tabs in a single step, something that until now required extensions or a lot of copying and pasting.
It works very simply: select several open tabs (using Shift + click, for example), right-click, and choose the "Copy X links" option . The browser automatically generates a list with each page title and its URL, ready to paste into an email, chat, or any document.
This detail might seem minor, but when you need to share resources or references with others, it saves a lot of time. Other browsers like Vivaldi had an advantage here, and now Firefox is catching up natively.
Mozilla has also decided to give users control over the behavior of tab groups created by dragging . In the tab settings, there's a new option to disable grouping when dragging tabs on top of each other. If you found this feature more annoying than helpful, you can now revert to the classic linear tab management.
Taken together, these improvements point to a very clear idea: that the browser allows you to better organize your work with many open pages without turning every small action into a waste of time.
Integrated PDF editor: getting closer to a dedicated tool
Firefox already had a basic PDF viewer and editor, but this version represents a significant leap forward. Starting with Firefox 150, the built-in editor allows you to reorder, copy, paste, delete, and export PDF pages directly from the browser.
This means that if you drag a local PDF file into a Firefox window, you're no longer limited to just reading or filling out forms: you can change the order of pages , duplicate sections, delete content you don't need, and generate a new PDF using only selected pages.
It's not meant to completely replace a professional editor, but for quick tweaks without leaving the browser it's more than enough: reorganizing a report, deleting blank pages, splitting a long document into several parts, or preparing a file to send by email.
The great advantage is that all of this is done using Firefox's own tools, without relying on cloud services or external programs. This is especially convenient for corporate or academic environments where installing additional software isn't always possible.
Private real-time translations and quick replies from the bar
Another area where Firefox 150 makes progress is in on-device content translation . Mozilla has long been committed to a system of private, AI-powered translations that run locally, without sending the text to external servers.
With this version, real-time translations are integrated into the internal page about:translations . To access it quickly, simply start typing the word "translate" (or the first few letters) in the address bar and select the specific card that appears as a suggestion.
On that page, users can paste any text , select the source and target languages, and see the result almost instantly. It's very useful for individual text snippets, emails, technical documentation, or any content you don't want to upload to external services.
In addition, Firefox 150 introduces a quick conversion feature directly from the address bar . If you type a query like “1000 mph to km/h”, the browser will display the conversion result directly, which you can copy with a single click, without needing to open a new tab or visit other pages.
This type of instant response reinforces the role of the address bar as the browser's command center , beyond simply being a field for writing URLs or searches.
Privacy and security: full control of access to the local network
Security is one of the major focuses of this update. Firefox 150 extends the Local Network Access specification to all users , a layer of protection that until now was only active for those with Enhanced Tracking Protection in "Strict" mode.
With this change, any website that attempts to connect to devices within your local network (printers, routers, IP cameras, home servers, services running on your own PC, etc.) will need your explicit permission. No more public websites trying to silently communicate with your internal network.
This system acts as a shield against request forgery attacks and other attempts to exploit internal ports or private IP addresses. It is especially relevant in home environments with outdated routers or in offices with more sensitive network devices.
In parallel, version 150 performs one of the most thorough code cleanups in the project's history. According to available information, approximately 359 vulnerabilities related to memory management, buffer overflows, and unauthorized access after resource release have been fixed.
The most striking finding is that 271 of these vulnerabilities were proactively detected during code validation by an artificial intelligence model (Claude Mythos), before they became exploitable. This collaboration between human and automated review drastically reduces the browser's potential attack surface.
Specific integration on Linux: GTK emoji picker and .rpm package
Although this article focuses on Windows, it's worth mentioning that Firefox 150 also comes with powerful new features for GNU/Linux distribution users , indirectly benefiting those who work in mixed environments.
On one hand, support for the GTK emoji picker has been added . From now on, when the cursor is in a text field, the system's standard emoji panel (usually with Ctrl + .) can be accessed directly within the browser, whether on web pages or in the Firefox interface itself.
This offers a consistent way to insert emojis without resorting to strange workarounds or extensions, aligning the experience with other common GTK applications on desktops like GNOME.
The arrival of an official stable Firefox .rpm package has also been announced , designed for distributions such as Red Hat Enterprise Linux, Fedora, openSUSE, and other RPM-based distributions. Along with the existing Firefox Nightly repository, this makes it easier to keep the browser directly aligned with Mozilla's release schedule without relying so heavily on distribution-specific release times.
Combined with the Snap and Flatpak versions, Linux users have more flexibility than ever to install and update Firefox , choosing the format that best suits their system or administrative policies.
Exclusive features and enhancements for Windows users
Returning to the topic of Windows, Firefox 150 introduces several specific improvements designed for those who use the browser installed from the Microsoft Store and for those who manage multiple profiles on the same computer.
First, Firefox web apps (PWAs) are now also available to users who installed the browser through the Microsoft Store. This allows users to create shortcuts to websites that run in their own window, with an appearance closer to that of a native application.
In addition, the new profile management system is being rolled out to all users, including Windows 10. The profile interface is clearer and allows for easy separation of personal, professional, and testing environments.
Perhaps the most useful feature in this section for those who frequently switch PCs or reformat their drives is the option to back up their user profile to a file . In Windows 10 and 11, you can already export all your settings (bookmarks, history, saved passwords, extensions, and other settings) into a package that can then be restored on a new installation.
In this way, migrating from one computer to another or recovering the environment after a reinstallation is no longer a headache, because the browser can be restored to exactly how it was in just a few steps.
Firefox Relay and VPN expansion: enhanced privacy
Alongside the improvements in Firefox 150, the 150.0.1 update brings a significant new feature to Firefox Relay , Mozilla's masked email service. From now on, users with a free plan can create up to 50 email aliases , compared to the previous limit of only 5.
This expansion is especially useful for those who frequently register for multiple services and prefer not to expose their primary email address. With more aliases available, it's easy to separate accounts by usage type (shopping, forums, newsletters, etc.).
Paid users go a step further, because they now have unlimited aliases , further reinforcing Mozilla's focus on email privacy and digital identity control.
On the other hand, the availability of Mozilla VPN / Firefox VPN (depending on the local name) continues to expand . This service, integrated into the company's ecosystem, remains limited to a select group of countries: the United States, the United Kingdom, Germany, and France, with Canada being added gradually.
The rollout is gradual and not all users have access yet, but the goal is to offer a monthly quota of encrypted traffic that hides the IP address and routes the connection through intermediary servers. It's an interesting add-on for those who prioritize privacy once the traffic has left the browser.
Developer tools and accessibility improvements
Firefox 150 hasn't forgotten about web developers. Changes have been made to the CSS style panel in the developer tools , which now better segments pseudo-classes related to expandable elements and visited links, making it easier to debug complex state.
In the network monitor, the browser makes it easy to detect secure connections whose certificates do not come from Mozilla's official root database , which is very useful for companies that use internal certificates or for diagnosing trust problems on specific sites.
At the design level, the light-dark() directive has been incorporated for images, allowing graphic resources to automatically adapt to the system's light or dark mode preferences. The color-mix() function has also been expanded to mix an unlimited number of colors, opening the door to more dynamic palettes.
Regarding multimedia content, pseudo-classes such as `:playing` and `:paused` are added to audio and video elements, allowing the interface to change its appearance depending on the playback state. This provides a clearer user experience, especially in custom media players.
In the area of accessibility, the incorporation of the ariaNotify API stands out , designed so that modern web applications can send more reliable notifications to screen readers and other assistive technologies, preventing users with disabilities from missing important interface changes.
Download and update Firefox 150 on Windows and other systems
- Windows: the easiest way to update to version 150 This involves using the browser's own internal update system. From the help menu or settings section, you can force a check for new versions; when an update is available, it will download in the background and be applied upon restarting.
- MacOS: the process is virtually identical, since the browser has the same integrated update mechanismIn both cases, there is no need to download manual installers unless you want to do a clean installation.
- Linux: depending on the distribution, Firefox may arrive as Snap package, Flatpak, .deb, .rpm or other formats. Ubuntu users, for example, typically receive the update via Snap with automatic background downloads.
Those who prefer Flatpak can update Firefox from Flathub using the usual flatpak update commands , while in distributions like Fedora or openSUSE you can use the new official .rpm package provided directly by Mozilla, in addition to the native repositories.
In any case, if you already had Firefox installed, version 150 should arrive automatically within hours or days, depending on your system and distribution channel. Only those who want to get ahead can download the official binaries from the Mozilla website and update manually.
With this set of changes, Firefox 150 establishes itself as a particularly interesting update for Windows users who want a more privacy-oriented browser, with more convenient tab management, a much more capable PDF editor, and a reinforced internal security level thanks to both new protections and a deep code cleanup assisted by artificial intelligence.
