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Tor Browser 15.0 Anonymous Web Browser Is Out Based on Firefox 140 ESR Series
Based on the Mozilla Firefox 140 ESR (Extended Support Release) series, Tor Browser 15.0 introduces many upstream features that have been implemented in the past year, including support for vertical tabs, support for tab groups, and the new unified search button that lets users easily switch between search engines, search bookmarks or tabs, and access quick actions.
For Android users, Tor Browser 15.0 introduces a screen lock as an extra layer of security for your browsing sessions and support for clearing your browsing session when Tor Browser is closed (just like on the desktop). Other than that, this release moves the blocking of the WebAssembly (a.k.a. Wasm) technology to NoScript, which is bundled with Tor Browser for managing JavaScript and other security features.
Linuxiac:
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Tor Browser 15.0 Arrives Based on Firefox ESR 140
The Tor Project has announced the release of its privacy-focused Tor Browser v15.0, now available for download, marking the first stable release based on Firefox ESR 140 and bringing an entire year’s worth of upstream improvements, privacy refinements, and security patches. Here’s what’s changed.
On desktop, the new version inherits a range of usability improvements from Firefox. The most visible change is vertical tabs, which stack open and pinned tabs along a sidebar, freeing horizontal space and improving navigation.
For those juggling multiple tasks, tab groups are another welcome addition. They let users organize open tabs into collapsible, color-coded groups, keeping browsing sessions tidy while maintaining Tor’s privacy-first behavior—since all tabs remain private and clear automatically when the browser is closed.
More authoritative source:
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New Release: Tor Browser 15.0
Tor Browser 15.0 is now available from the Tor Browser download page and distribution directory. This is our first stable release based on Firefox ESR 140, incorporating a year's worth of changes that have been shipped upstream in Firefox. As part of this process, we've also completed our annual ESR transition audit, where we reviewed and addressed around 200 Bugzilla issues for changes in Firefox that may negatively affect the privacy and security of Tor Browser users. Our final reports from this audit are now available in the tor-browser-spec repository on our GitLab instance.
The ongoing development of Tor Browser is made possible thanks to the support of our community. If Tor Browser is important to you, now is a great time to support our mission to FREE THE INTERNET, as all donations will be matched by Power Up Privacy through December 31, 2025.