I'm getting a prompt to update safari when I visit a website NOT from apps page
I'm getting a prompt when I visit some websites to update to a new version of safari and this doesn't seem to be coming from apple. I, of course, don't do the update. I'm thinking that someone is doing some naughty on these respective wed sites but wanted some feed back first. thanks.
Mac mini (Mid 2010), OS X Yosemite (10.10.4)