During the morning and afternoon when I check in to Chowhound see what's new, all is well. Late afternoon and evening, I get a message across the top of my screen saying that I need plugins to see all media that's available on the page.
I'm using firefox 18.104.22.168. I wonder why the message only appears in the evening (I'm located in northern California and using Mac OS X version 10.4.11.) Do I need these plugins? Will I harm my (elderly) iMac by downloading them?