Firefox browser can't resolved dashlane issue if it doesn't work with Firefox browser. It's up to dashlane to resolve why their software doesn't work with Firefox.

I cannot get my Dashlane extension to work with Firefox but it does work fine with Chrome and Edge so it is not a PC problem on my end. Until this week, it worked just fine. After updated my browser, I can no longer successfully log onto my Dashlane account. I first get a screen asking for my log in email. Once entered, a screed appear with "Performing a security check." This is the point were normally a Captcha screen would appear. Instead, the next screen to appear is "something went wrong. An unexpected error occured during the security check. Please close this tab and try again.". I click on the close this tab button and am sent to a log in page for Dashlane that requests the verification code that was sent to you contact email. No code arrives although I have gotten emails from using the other browsers so it is not a case of blocked emails. This is obviously a security issue but I can't resolve it. I have listed Dashlane as an exception under Cookies and Site Data to allow cookies. I also made it an exception for enhanced tracking protection. No luck. Using firefox 138.0.4 (64-bit) Need help please!!

I had precisely the same problem on my desktop computer — the same error message and the same failure to receive an email after requesting a verification code. I also found that the Dashlane extension worked in Chrome and Edge but not in Firefox after I updated it on May 23. I tried uninstalling and reinstalling both the Dashlane extension and Firefox itself. I tried adding Dashlane as an exception in Firefox. I tried suppressing antivirus and antimalware software. Nothing worked. Then I remembered that I had a similar installation on my laptop. I connected the laptop to the same wifi signal used by my desktop computer and got the same error message when I invoked the Dashlane extension in Firefox — but after Dashlane failed its security check, it did respond to my request for a verification code via email. When I entered the code on my desktop installation, Dashlane immediately responded with another email announcing “New Device Added.” I was able to get a second verification code to get my laptop installation recognized as well. Both installations are working like they did before now.