See what landed recently in Firefox Nightly!

Starting with Firefox 148, Split View is enabled in Nightly builds. You can view two tabs side-by-side in a single window, making it easier to compare information, research topics, or work across multiple pages at once. You can create a Split View directly from a tab’s context menu.

Starting with Firefox 148, Nightly builds have stability improvements to the legacy search bar, as well as aligning its search button with the latest designs.

Starting with Firefox 148, the updated Firefox sidebar is now enabled by default for new profiles in Nightly builds. It provides quick access to tools like bookmarks, history, and AI chatbots. Use the settings gear icon at the bottom of the sidebar to add and remove tools, try vertical tabs, or move the sidebar.

Starting with Firefox 148, HDR video on Windows is now supported in Nightly builds. This is considered experimental as we gather feedback before enabling it in regular releases. This feature works best when HDR mode is enabled in Display Settings (this may require a page refresh); otherwise, the display driver is likely to apply a tonemapping effect for non-HDR viewing. Some streaming sites may still not offer HDR video in Firefox.

Starting with Firefox 147, Nightly and Beta builds (b6 and earlier) now support the Sanitizer API, which provides new methods for HTML manipulation. The element.setHTML() method enables developers to insert HTML content similarly to element.innerHTML, but without the security vulnerabilities such as cross-site scripting (XSS). A complementary method, document.parseHTML(), is also available for parsing HTML safely.

Starting with Firefox 148, Nightly builds now support the Document Picture-in-Picture API, which allows web pages to place content in an always-on-top popup.