What’s new in Firefox 155?
The “AI” feature known as “Smart Window” (currently still labeled as a beta version) now makes it easier to revisit topics you’ve already covered. Questions are intended to be answered more quickly, complete with source references. It’s being rolled out gradually.
The isolated tab environments introduced with Firefox 153 can now be sorted according to user preferences in settings. Tab environments isolate cookies from one another, allowing you to log in to the same website with different accounts across different tabs. This means you can, for example, actively use multiple Gmail inboxes at once.
Another small improvement involves the display in the address bar that shows how many trackers were blocked on the current page. Firefox now allows this display to be disabled in the settings without turning off tracker blocking altogether. This feature is being rolled out gradually.
The free built-in VPN feature, which was introduced back in Firefox 149, continues to offer the expanded selection of 32 virtual locations, but now that August is over, the unlimited data usage has been ended and is now capped at 50GB per month again. The free VPN is now also rolling out on Firefox for Android, with iOS set to follow soon.
Other improvements include: the ability to scale up small PDF files to fit paper size when printing, and support for Nintendo Switch Pro controllers when playing browser-based online games on Windows. Since Firefox 154, there’s also been support for game streaming with Nvidia GeForce Now.
Security flaws fixed in Firefox 155
In the security advisory for Firefox 155, Mozilla lists 29 security vulnerabilities that have been fixed, 25 of which were discovered and reported by external security researchers. Mozilla classifies 10 of these vulnerabilities as high risk, including several use-after-free (UAF) flaws that could allow malicious code to escape the browser’s sandbox.