Its safer because less hackers target it, and less people use it. Firefox updates dont mean that it is any safer just means they are patching shit. And no your not right your actully wrong.
Your system as propably got a firewall which allows firefox through better than chrome. On all bench marks thorughout the PC sites chrome consistently shows as a faster browser. Your compute is not a benchmark is it??? so dont you that as a reasonable reason to say that chrome is slower. Also i doubt you actully know anything about browser security to actully make any come back to what i said about it, but in reason, the more popular a browser is the more it is easier for it to get explioted. IE > Firefox > what ever is next.