Comment 87 for bug 195698

I also disagree with Mike Connor that this is an extension bug. Although, it may be exacerbated by extensions that need a password. If you have ever experienced this behaviour you will know how frustrating the experience can be of being bombarded by master password dialogs. It is really not a pleasant experience.

There is an implementation issue here, the fact that more than one master password dialog can be open at any one time is the cause. Serializing access to this dialog would be the solution. Embedding the request for the master password in the URL edit control would be another, although that would result in synchronization as well. The reason why I favour the second approach is that it would focus more security related functionality into this part of the interface, as is being done with the anti-spoofing features.