Firefox 155 Expands Smart Window AI and Shows Blocked Tracker Counts in the Address Bar
Firefox 155 puts blocked tracker counts in the address bar and opens Smart Window to all users in the US, Canada, and France, making both privacy protection and AI assistance more visible.
Reporting from 1 source: GIGAZINE.
Firefox 155 is out. The AI browsing assistant Smart Window now reaches all users in the United States, Canada, and France, with personalized conversation-resume suggestions and faster web-search answers that cite Exa. The address bar now shows how many trackers the browser blocked, a count that can be hidden without disabling protection. Containers can be reordered by drag, translation adds Marathi and Urdu, and Windows builds improve Nintendo Switch Pro controller support in web games.
Firefox 155 also changes how the browser handles PDF printing: when a PDF page is smaller than the paper, the print scale can now go above 100 percent to fill the sheet. The release caps CSS nesting at 75 levels to prevent crashes from extremely deep nesting, and mailto: links now launch the default mail app only after an explicit user action such as a click. The portal detection domain moved from detectportal.firefox.com to firefox-portal-detection.com.
On the developer side, the debugger gains a shortcut to toggle all breakpoints at once, JSON Viewer handles JSONL and NDJSON formats, and WebAssembly adds Compact Import Section and Wide Arithmetic support.
Synthesized by Yomimono from the 1 cited source below, including Japanese-language reporting where cited, then editorially reviewed before publishing.