Could a Browser update create false positives with social media security?

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If you have an account with Facebook and you have ever been told you need to change your password then this discussion is for you. I recently logged into my Facebook account, often I forget to log out at the end of a session as I use Facebook 24/7 almost. It is like an open communications network with my family and friends and my followers. What happened before I was notified by Facebook security when I went to my timeline was that I was informed that an attempt, an unauthorized attempt to gain access to my account was prevented but it was necessary for security purposes to change my password. Now, this would have been suspicious if it had come to me in an email but then it could just as easily be legitimate. In security settings notifications are optional for both email alerts or site alerts when and if another user tries to gain access to my account or my wall using anything other than a computer with my specific IP address and a device different than my windows PC and from a browser other than Firefox. It so happens that my browser emulates Firefox but is actually SeaMonkey as both browsers are a Mozilla product and have shared codes and it seems that Facebook recognizes my browser as Firefox not SeaMonkey. I got an auto update to my browser a few days ago. It has suddenly occurred to me that maybe quite possibly, that update to my browser caused a false positive at their end, that is, at the server end of Facebook and their security system interpreted my updated browser as unfamiliar. If that is the case I have been worried needlessly over an intrusion attempt by a hacker when it may have actually only been my updated browser that signed into Facebook but was thought by their security programs to be an intrusion. I have to do more research on this to determine if such issues are related to Firefox or SeaMonkey upgrades or updates to learn more.