Safari's and Firefox's strange behavior
I am using an iMac 3.2Ghz Intel Core 3, 12GB RAM, System 10.6.8.
Two days ago Safari and Firefox started acting "screwy." Some web pages won't load, some load excruciatingly slow, and some load OK as before. Using Google to search for something takes 5-8 minutes to produce any "hits," and if you choose any links, they take forever to load too.
Oddly, Chrome works without any issues... so far. Web pages load quickly in Chrome. Google searches produce results in seconds.
Concurrently, my Mail app stopped working too. I can no longer send or receive eMail from my Comcast account and my gMail account. Mysteriously, my iCloud account works fine. I have checked and re-checked all the account information. On my iPad and my Mac Book Pro, my Comcast and gMail accounts work correctly as usual.
What would cause this issue? Can I correct it?
Could I reinstall Snow Leopard? I remember you used to be able to do something called a "clean install" and replace the system folder with a brand new system. Can you still do that? Could that be a possible fix?
iMac, Mac OS X (10.6.8), (January 2011)