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Firefox code signature could not be verified ?

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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 ?

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