Thanks for the reply. I must admit that I don't have any version details at your suggested location though. Since my last post, I updated my Firefox using the ftp link in the first post of the thread, that might be why.

I've found it by going to options -> about Firefox instead. It did that before also, but the version just didn't make any sense then.

Earlier today I downloaded Firefox Beta from firefox.com/m/beta and I didn't really see anything new. After installing from the ftp link: Wow!

Now my version details also makes sense again.