# JavaScript Res Detection in Firefox **URL:** \ **Category:** web dev\ **Created:** [August 26, 2005, 3:42am UTC](https://forum.kirupa.com/t/javascript-res-detection-in-firefox/160465 "2005-08-26T03:42:44Z")\ **Posts on this page:** 1\ **Page:** 1

**Author:** ![ERNANDE](https://avatars.discourse-cdn.com/v4/letter/e/4af34b/32.png) [@ERNANDE](https://forum.kirupa.com/u/ERNANDE)\ **Post date:** [August 26, 2005, 3:42am UTC](https://forum.kirupa.com/t/javascript-res-detection-in-firefox/160465/1 "2005-08-26T03:42:44Z")

I’m trying to use a JavaScript detection to determine the user’s screen resolution. My script works fine in every browser except Firefox. No matter what resolution I use, my alert notifies me that I’m using 1024x768. What could I be doing wrong? ```auto ```