Have been using my new MacBook Pro over the weekend - finally!! - and my experience with FireFox keeps getting more and more weird?!

In another thread, I have been having FireFox v25 Cookie Issues, and now this morning I got the following message in the bottom of my browser...

It looks like you haven't started FireFox in a while. DO you want to clean it up for a fresh, like-new experience? And by the way, welcome back! << Reset FireFox... >>
(Here is a screen-shot... )
Attachment 63602

What is going on?!

Umm, I was just using FireFox last night about 8 hours ago...

Do I have a virus?

What is going on with my poor browser lately?!