Q: Safari will not load a webpage but FireFox works on my mid 2009 MacBook Pro running Yosemite. Performed all the sugestions for removing extensions and plug-ins with no effect.

No. I did perform a complete reset of my wifi router which fixed the problem briefly. I have started using an old Airport express in place of the Belkin 600 for the time being and the problem has not returned. I'm perplexed as to why the router sees Safari and the App Store different than Firefox. It seemed to only affect Apple products on my Mac. I was still able to get updates on all programs (like Adobe) with no issue connecting to the appropriate websites. The only Apple App that would work is the e-mail. I'm looking at a new router as my solution, however I'm still curious about how this happened.