Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

I am getting a communicat from Java Script that: exc in ev handl Type Error: brw is undefined, Can you help me? Thank you. I don't know what to do.

  • 1 reply
  • 6 have this problem
  • 7 views
  • Last reply by cor-el

more options

Exc in ev handl: TypeError: brw is undefined. Problem.

Exc in ev handl: TypeError: brw is undefined. Problem.

All Replies (1)

more options

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).