As part of the ongoing story, updates are also available for the ESR versions. The newest major drop of Firefox 154 for Windows, macOS, Linux, and Android brings a number of usability improvements, such as system update streaming with Nvidia GeForce Now, faster video skipping, and fresh optional app icons, as well as nearly 60 security vulnerabilities fixed.
As part of the ongoing story, with it, Mozilla is switching—like Google Chrome and Microsoft Edge—to a fortnightly drop cycle for its major versions. The next major version of Firefox 155 is scheduled for September 1st.
Industry observers note that also limited to Windows for now is the option to choose a different app icon for Firefox, as is already available on Android and iOS. (macOS and Linux are set to follow later.) Options include the old Firefox icons from 2004 and 2017, a rainbow-style icon (“Pride”), and bonus icons. For Windows users, Firefox 154 now offers system update streaming via Nvidia GeForce Now, which can save on the cost of expensive devices.
As part of the ongoing story, and while the translation capability for web pages previously relied on information provided by the website itself regarding the language used, Firefox now performs its own language detection. This means that content from iframes is now also translated. If you add websites to the exception list for deleting cookies and website content, they are no longer automatically excluded from tracking protection. On all services, skipping to a different part of a video should now be faster.
According to the latest update, the free VPN is currently available to Firefox users in the US, Canada, the UK, France, and Germany. In addition, the free VPN can now also be used in Firefox for Android (rolling out gradually) with iOS to follow soon. The free built-in VPN, introduced with Firefox 149, continues to offer a selection of virtual locations—temporarily extended to 28 countries until the end of August—with unlimited data.
According to the latest update, mozilla classifies 17 of these vulnerabilities as high risk. A further 30 vulnerabilities are classified as medium risk, with the remainder classified as low risk. In the security report for Firefox 154, Mozilla lists 58 resolved security vulnerabilities, 54 of which were discovered and reported by external security researchers.
Industry observers note that the vulnerabilities are grouped according to which program versions are affected. The last four entries in the security report (CVE-2026-74987 to CVE-2026-74990) summarize an unspecified number of internally discovered security vulnerabilities, most of which are classified as high risk, resulting from programming errors in memory management.
According to the latest update, however, the latter are only available for Windows 7 and 8.1, and macOS 10.12 to 10.14. In addition to Firefox 154.0, the ESR drops 153.1.0, 140.14.0, and 115.39.0 are also available.
The report highlights that that amounts to more than 52 security vulnerabilities fixed in Firefox 153.1.0, at least 31 in Firefox 140.14, and at least 13 in Firefox 115.39. Firefox ESR 140 will be replaced by Firefox ESR 153 in October. In the ESR versions, Mozilla has fixed those of the above-mentioned vulnerabilities that are present in the code of those older browser generations.
In a fresh development, this article originally appeared on our sister publication PC-WELT and was translated and localized from German.
In a fresh development, his main topics are IT security (malware, antivirus, security gaps) and Internet technology. Frank Ziemann has been working as a freelance author for sister site PC-WELT since 2005, writing news and test reports.