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!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

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

On login to my bank, Firefox has a popup asking me to open or download a file called ibank.dll. This happens only on this browser, not on Explorer, Opera, or Safari.

  • 5 replies
  • 7 have this problem
  • 21 views
  • Last reply by zzxc

more options

When logging in on my bank, Firefox also loads a box with "You have chosen to open ibank.dll which is a document from https://[bank name site]. I can still log into my account, but the extra window is annoying. This happens only on Firefox. It does not occur if I log in from Explorer, Opera, or Safari. I use an iMac.

URL of affected sites

http://

When logging in on my bank, Firefox also loads a box with "You have chosen to open ibank.dll which is a document from https://[bank name site]. I can still log into my account, but the extra window is annoying. This happens only on Firefox. It does not occur if I log in from Explorer, Opera, or Safari. I use an iMac. == URL of affected sites == http://

All Replies (5)

more options

Does this happen after you clear the cache?

Follow the steps at How to clear the Firefox cache

more options

Clearing the cache and/or deleting cookies does not affect this problem. Checking or unchecking allow popups does not affect the problem, either.

This occurs only on Firefox.

more options

Clearing cache and/or erasing cookies does not solve the issue.

more options

Clearing cache and/or deleting cookies does not resolve this issue. This happens only on Firefox.

more options

According to this, it is a problem with the bank site's software:

http://softsolder.wordpress.com/2010/03/13/why-friends-dont-let-friends-run-windows-mystery-banking-dll/

According to this, it could be malware (search/find on the page, it is near the bottom):

http://www.secureworks.com/research/threats/blackenergy2/