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

Error message "ISWUIlib.dll missing each time I start Firefox

  • 1 reply
  • 4 have this problem
  • 1 view
  • Last reply by Logan

more options

This error comes up each time I open Firefox. I go on and Firefox works fine.

This happened

Every time Firefox opened

This error comes up each time I open Firefox. I go on and Firefox works fine. == This happened == Every time Firefox opened

All Replies (1)

more options

Uninstall and reinstall ZoneAlarm Forcefield. That should fix the problem.

See this thread.