Hello, I decided to use your master password feature. I've written the password on paper for backup purpose. And everything worked fine for aprox. 1 month. But today to my surprise Firefox told me that master password is wrong. I've typed this password at least several times before (with success) so I was sure that I remember it correctly. Fortunately I had it on the paper. I checked it - and I realized, that I remembered it correctly. So I tried once again but I failed. I tried few times with the same result. I had the same password also for different site. So I logged on that site - with success. So my keyboard seems to work correctly. I didn't change master password in Firefox. At least I am not aware of that. It was unchanged for whole period I used this feature, as I wrote it wasn't long. Fortunately I have all important passwords saved on the paper so I decided to reset my Firefox Master password. It is possible that I've lost less important passwords but I can reset them because I still have access to my most important data. I do not need any help. And I am aware that I could made mistake of any type. But I decided to report that because there is also a chance that this is Firefox error so you should be aware of my case.