Comment on Massive Passive Profits Plugin Setting Up a Sub-Domain Blog Template with Talian 05 by SEO Dave.
You setup a blog template that you’ve deleted the Welcome Page from and your new sub-domains will not have the welcome page.
See the Massive Passive Profits Plugin Setting Up a Sub-Domain Blog Template with Talian 05 article
You can do a lot more with blog templates than remove the Welcome Page.
I haven’t an answer for your question
“Question on Google AdSense Ads: The “Ads by Google” label is replaced by “Why this ad” when I view my sites in FireFox, however, not so in Internet Explorer.”
I think it’s supposed to always say “Ads by Google”, but I’ve never really looked to be honest. Had a quick check and my sites look the same in IE and Firefox.
About the only thing that comes to mind is your FireFox installation has malicious code, someone hacked your PC and is serving different ads instead of Googles. I would scan my PC for viruses and malware, checkout SpyBot Search and Destroy (it’s free) and finds most malicious programs (adware etc…).
Search Google for
“Why this ad” Google
Shows you aren’t the only person seeing this, though the handful I checked had no idea what it meant.