Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

Why does Firefox 53 hang when attempting login to CAC enabled (.mil) website?

  • No replies
  • 16 have this problem
  • 8 views
Eng78
Eng78

Firefox version 53.0.3 on Windows 7 (64-bit) hangs when attempting to login to a website that requires SmartCard authentication, specifically, authentication to a .mil website using a DoD Common Access Card. Firefox becomes completely unresponsive when website requests login credentials and must be terminated from the Task Manager. ActivClient PIN request dialog box will appear after Firefox closes (this is NOT a pop-under). This problem has been reproduced on multiple systems and multiple websites. (All systems were updated to version 53 from version 52 or older.) To date, no CAC enabled website or systems have been identified where Firefox 53 works for this scenario. Older versions of Firefox and Firefox ESR 52.1.2 work. See https://militarycac.com/firefox.htm for information on configuring Firefox to use CAC authentication with ActivClient middle-ware.

Firefox version 53.0.3 on Windows 7 (64-bit) hangs when attempting to login to a website that requires SmartCard authentication, specifically, authentication to a .mil website using a DoD Common Access Card. Firefox becomes completely unresponsive when website requests login credentials and must be terminated from the Task Manager. ActivClient PIN request dialog box will appear after Firefox closes (this is NOT a pop-under). This problem has been reproduced on multiple systems and multiple websites. (All systems were updated to version 53 from version 52 or older.) To date, no CAC enabled website or systems have been identified where Firefox 53 works for this scenario. Older versions of Firefox and Firefox ESR 52.1.2 work. See https://militarycac.com/firefox.htm for information on configuring Firefox to use CAC authentication with ActivClient middle-ware.