Firefox 151 brings a giant privateness enhance and fixes 30+ safety flaws

The newest model of Firefox for Home windows, macOS, Linux, and Android brings various enhancements to privateness safety, the built-in PDF viewer/editor, and the VPN function, plus fixes for over 30 safety vulnerabilities. Updates are additionally accessible for the ESR variations.

What’s new in Firefox 151?

The free VPN function that was launched again in Firefox 149 now provides a alternative of a number of digital places. Firefox’s VPN function is presently accessible to customers within the US, Canada, the UK, France, and Germany—and people very nations at the moment are accessible as VPN places. You’ll want a free Mozilla account to make use of the VPN, and also you’ll get 50 GB of VPN visitors allowed per thirty days. The situation choice is progressively rolling out.

If you happen to use Firefox personal home windows, now you can clear a whole session with one button click on, no want to shut the browser window. It will begin a contemporary personal session with no historical past. There’s additionally improved monitoring safety in Firefox 151, which Mozilla claims ought to scale back the variety of customers that advertisers can establish utilizing commonplace fingerprinting methods by 14 % general (diminished by as much as 50 % on macOS alone).

The revamped “New Tab” web page provides extra background pictures and is prepared for brand new options that Mozilla plans to roll out within the lead as much as the discharge of Firefox 152 on June sixteenth.

The built-in PDF viewer/editor has gained one other function: it could actually now merge a number of PDF recordsdata right into a single doc. The interior web page for translating any textual content (//about:translations) is now additionally accessible by way of the menu beneath “Extra Instruments.” Linux customers can now additionally again up their Firefox profiles domestically and restore them throughout platforms.

Safety flaws fastened in Firefox 151

In Mozilla’s Safety Advisory 2026-46 for Firefox 151, the corporate lists over 30 fastened safety vulnerabilities, 28 of which had been found and reported by exterior safety researchers.

Mozilla classifies 4 of these 28 externally found safety vulnerabilities as excessive threat, together with a possible escape from the browser sandbox (CVE-2026-8945). An extra 11 vulnerabilities are categorized as medium threat, with the rest as low threat. The final three entries within the Safety Advisory summarize internally found vulnerabilities ensuing from programming errors in reminiscence administration.

Tip: Whether or not you retain your browser updated, you want correct antivirus protections in order for you your PC to stay safe and personal. Take a look at our picks for the very best antivirus software program for Home windows in addition to greatest VPN companies to remain forward of safety issues.

Different browser updates

Along with Firefox 151.0, the ESR variations 140.11.0 and 115.36.0 are additionally accessible. The latter is just accessible for Home windows 7/8.1 and macOS 10.12 to 10.14. Within the ESR variations, Mozilla’s builders have fastened these of the above-mentioned vulnerabilities that had been already current within the code of these older browser generations: Firefox 140.11 accommodates at the least 20 fixes and Firefox 115.35 has at the least seven fixes. Firefox ESR 115 will proceed to obtain safety updates till August 2026.

Thunderbird 151.0 and 140.11.0esr are additionally attributable to be launched shortly. In these variations, the builders have likewise fastened dozens of safety vulnerabilities inherited from Firefox.