The latest user agents for web browsers on Firefox

Updated at: Apr 19, 2026

Mozilla Firefox runs on a several different operating systems and the user agent structure for each varies a bit.

Here we have the latest user agents for Firefox on Windows, macOS, Linux, iOS and Android.

Please note that these are very "stock-standard" Firefox user agents and certainly don't reflect the wide variety of possible Firefox user agents that exist today. These user agents don't show anyextra addons, network providers or anything else customised or particular; these are just the standard user agents.

Explore our huge user agent listing, download our user agents database, (or you can search it) if you're curious about other user agents.

Get latest user agents for Firefox via API

Our Web Browser/Operating System Version Numbers API endpoint will provide you with the latest user agents for all sorts of popular web browsers and operating systems.

Latest Firefox on Desktop User Agents

Platform	Latest Firefox User Agents
Firefox on Windows	Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:149.0) Gecko/20100101 Firefox/149.0
Firefox on Macos	Mozilla/5.0 (Macintosh; Intel Mac OS X 15.7; rv:149.0) Gecko/20100101 Firefox/149.0
Firefox on Linux	Mozilla/5.0 (X11; Linux i686; rv:149.0) Gecko/20100101 Firefox/149.0 Mozilla/5.0 (X11; Linux x86_64; rv:149.0) Gecko/20100101 Firefox/149.0 Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:149.0) Gecko/20100101 Firefox/149.0 Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:149.0) Gecko/20100101 Firefox/149.0 Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:149.0) Gecko/20100101 Firefox/149.0

Latest Firefox on iOS User Agents

Platform	Latest Firefox User Agents
Firefox on Iphone	Mozilla/5.0 (iPhone; CPU iPhone OS 15_7_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/149.0 Mobile/15E148 Safari/605.1.15
Firefox on Ipad	Mozilla/5.0 (iPad; CPU OS 15_7_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/149.0 Mobile/15E148 Safari/605.1.15
Firefox on Ipod	Mozilla/5.0 (iPod touch; CPU iPhone OS 15_7_5 like Mac OS X) AppleWebKit/604.5.6 (KHTML, like Gecko) FxiOS/149.0 Mobile/15E148 Safari/605.1.15

Latest Firefox on Android User Agents

Platform	Latest Firefox User Agents
Firefox (Standard)	Mozilla/5.0 (Android 16; Mobile; rv:149.0) Gecko/149.0 Firefox/149.0
Firefox on Lg	Mozilla/5.0 (Android 16; Mobile; LG-M255; rv:149.0) Gecko/149.0 Firefox/149.0

Latest Firefox Extended Support Release (ESR) on Desktop User Agents

Platform	Latest Firefox User Agents
Firefox on Windows	Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:140.0) Gecko/20100101 Firefox/140.0
Firefox on Macos	Mozilla/5.0 (Macintosh; Intel Mac OS X 15.7; rv:140.0) Gecko/20100101 Firefox/140.0
Firefox on Linux	Mozilla/5.0 (X11; Linux i686; rv:140.0) Gecko/20100101 Firefox/140.0 Mozilla/5.0 (Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0 Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:140.0) Gecko/20100101 Firefox/140.0 Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0 Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0

Special notes

Major release version numbers only

For a while now, Firefox's user agent has only included the "major release" version number in the user agent; so while a copy of Firefox might actually be version 61.0.2, it would only be reported as version "61.0" in the user agent.

Experiment with different user agents

You can use our User Agent Parser page to try out different user agent varieties, or to test if your user agent switcher is working properly.