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

Firefox code signature could not be verified ?

  • 1 cavab
  • 9 have this problem
  • 5 views
  • Last reply by cor-el

more options

Does anyone else have a problem like this since the last May 19 Update ? I use 1Password as my password manager and tried to use it to log into some sites, but continually get the message box - "Cannot Fill Item in Firefox. Firefox is connected but its code signature could not be verified. Filling and other features are disabled until this configuration issue is resolved." I notice there was an update to 53.0.3 (64bit) on 19 May and this is the first time I have used 1Password since this update. I confirm I am also up to date with 1Password, so they should work together. Any ideas or advice please ?

Does anyone else have a problem like this since the last May 19 Update ? I use 1Password as my password manager and tried to use it to log into some sites, but continually get the message box - "Cannot Fill Item in Firefox. Firefox is connected but its code signature could not be verified. Filling and other features are disabled until this configuration issue is resolved." I notice there was an update to 53.0.3 (64bit) on 19 May and this is the first time I have used 1Password since this update. I confirm I am also up to date with 1Password, so they should work together. Any ideas or advice please ?

All Replies (1)

more options