Mozilla Firefox 136 New Features

Mozilla released Firefox 136 on March 4, 2025. Here's the list of new & improved features:

Firefox for Windows

New Features

Updated Sidebar

You can now enable the updated Firefox sidebar in Settings > General > Browser Layout to quickly access multiple tools in one click, without leaving your main view. Sidebar tools include an AI chatbot of your choice, bookmarks, history, and tabs from devices you sync with your Mozilla account.

Vertical Tabs

Keep a lot of tabs open? Try our new vertical tabs layout to quickly scan your list of tabs. With vertical tabs, your open and pinned tabs appear in the sidebar instead of along the top of the browser. To turn on vertical tabs, right-click on the toolbar near the top of the browser and select Turn on Vertical Tabs. If you’ve enabled the updated sidebar, you can also go to the Customize sidebar and check the Vertical tabs. Early testers report feeling more organized after using vertical tabs for a few days.

Clear Browsing Data Update

The Clear browsing data and cookies dialogue now allow clearing saved form info separately from the browsing history.

SmartBlock Embeds

Smartblock Embeds allows users to selectively unblock certain social media embeds that are blocked in ETP Strict and Private Browsing modes. Currently, support is limited to a few embed types, with more to be added in future updates.

HTTPS-First

Firefox now upgrades page loads to HTTPS by default and gracefully falls back to HTTP if the secure connection fails. This behaviour is known as HTTPS-First.

Platform-Specific Updates

  • On macOS, some background tabs will be moved to lower power cores, reducing energy usage.
  • Hardware-accelerated playback of HEVC video content is now supported on macOS.
  • Hardware video decoding is now enabled for AMD GPUs on Linux.
  • On Linux, Firefox is now available on ARM64 (AArch64), with installation options via APT and tarballs. Flatpak support is coming soon.

Weather forecast in more countries

The Weather forecast on the New Tab page is expanding to additional regions, including Mexico, Brazil, Argentina, and Chile, as part of an ongoing regional rollout.
This feature is part of a progressive rollout.

Address autofill in the UK.

Address autofill is enabled for users in the United Kingdom.

Fixed

  • Firefox will now prefer the PNG format when copying images out of Firefox, allowing the preservation of transparency.
  • Various security fixes.

Changed

  • For New Tab stories, the Save to Pocket action was moved from a button to the context menu along with other actions, such as Bookmark.
  • The macOS DMG installer packages now use LZMA for compression, reducing download size and installation time.
  • Due to recent changes in macOS Sequoia, the shortcut for completing search strings to .com addresses has been changed from Ctrl+Enter to Cmd+Enter.

Web Platform

  • Added support for the Intl.DurationFormat object; this enables language-sensitive duration formatting.
  • Added support for the CSS:o pen pseudo-class for styling elements that can be toggled “open” to display more content.
  • Added support for the:has-slotted pseudo-class, allowing authors to style the contents of a <slot> element when it is not empty or not using the default value.
  • Added support for the CookieStore API, an asynchronous cookie API for scripts running in HTML documents and service workers.
  • Added support for ARIA elements reflection.
  • Firefox now sends a referrer from meta refreshes and Refresh headers.
  • Added support for sending and receiving the AV1 video codec over WebRTC. Both singlecast and simulcast are supported for sending.
  • Added support for sending multiple simultaneous versions of the same source over WebRTC, commonly called simulcast, with the H264 video codec. H264 is the second video codec after VP8 to be supported for sending simulcast.
  • The value plaintext-only can now be specified for the content editable attribute, making the raw text of an element editable but without supporting rich text formatting.
  • Added support for the text replacement feature in an input field on macOS. Web content can enable/disable this using the HTML autocorrect attribute.

Firefox for Android

New Feature

  • The Web Compatibility Reporting Tool is now available for reporting site issues. If a website isn’t working in Firefox but functions correctly in another browser, you can report it by opening the menu via the three-dot button and selecting “Report broken site”. Provide the form with as much information as possible, and you’ll directly help us detect, target, and fix the most impacted sites to make your browsing experience on Firefox smoother.
  • Firefox now detects if the software keyboard supports autocorrect and enables suggestions when available.

Fixed

  • Fixed an issue where downloading files with the same name would overwrite the existing file.
  • Fixed an issue where downloads would fail if the file name was too long.
  • Various security fixes.
Source: Mozilla

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