Firefox 140 improves internet translation efficiency and pinned tabs

The most recent Firefox replace brings the browser as much as model 140 with varied new options and enhancements. For instance, the inner translation characteristic is extra resource-efficient and pinned tabs are extra versatile. The builders have additionally fastened a number of safety vulnerabilities. Firefox ESR and Tor Browser additionally acquired safety updates.

Mozilla plans to launch variations Firefox 141 and Firefox ESR 140.1, ESR 128.13, and ESR 115.26 on July twenty second, 2025.

What’s new in Firefox 140?

Firefox’s native translation characteristic initially solely interprets content material that’s at the moment seen within the browser window. Solely once you scroll to beforehand unseen sections of a web page will it then translate that content material. This reduces useful resource consumption and improves efficiency.

Should you use the vertical tabs launched with Firefox 136 together with pinned tabs, now you can preserve extra (or fewer) pinned tabs in view. All you need to do is transfer the separator line.

Firefox now additionally helps much more search engines like google that you may add. To do that, right-click within the search discipline of a (supported) web site and choose “Add search engine” from the context menu. For Firefox customers within the US on model 139 and better, Mozilla added the AI-based search engine Perplexity to the usual choice in mid-June on the request of customers.

Safety updates in Firefox 140

Mozilla’s 2025-51 Safety Advisory reveals 17 vulnerabilities fastened for Firefox 140. Mozilla categorizes one of many externally reported vulnerabilities as excessive danger. It’s a use-after-free vulnerability (CVE-2025-6424) within the FontFaceSet API. An attacker might exploit it by scary a crash that will execute injected code.

5 internally found vulnerabilities, summarized below CVE-2025-6436, are additionally thought-about excessive danger. All different vulnerabilities that Mozilla’s builders have fastened in Firefox 140 are categorized as medium or low danger. One in every of them, CVE-2025-6431, solely impacts Firefox for Android.

Updates for Firefox ESR and Tor Browser

Firefox 140 is the latest normal model for Firefox ESR. Firefox ESR 140 will initially be an identical to the common Firefox 140, however it is going to solely obtain safety updates and essential bug fixes, not new options.

Mozilla will assist Firefox ESR 128 and ESR 140 in parallel till August nineteenth, when this transition section will finish. Firefox ESR 115 can be deliberate to finish assist with the August replace, except Mozilla decides to increase the deadline once more (to be introduced in August).

Mozilla has up to date its long-term variations Firefox ESR 128 and ESR 115 and in addition fastened some vulnerabilities, specifically the FontFaceSet flaw talked about above. 5 vulnerabilities have been fastened in Firefox ESR 128.12.0 and two in Firefox ESR 115.25.0.

The up to date Tor Browser 14.5.4 relies on Firefox ESR 128.12.0 and comes with the brand new NoScript model 13.0.8. The Tor builders state that they’ve additionally ported safety fixes from Firefox 140. An replace for Tor Browser 13.5 to model 13.5.19 can be obtainable in case you are utilizing Home windows 7 / 8.1 or macOS 10.12 to 10.14. Tor Browser 13.5.19 relies on Firefox ESR 115.25.0 and in addition contains NoScript 13.0.8.