Sadly (it happens to me too), most of these pages use either a Meta
For the former case, Firefox (not Safari) had an option to disable it (Tools >> Options >> Advanced >> General >> Accessibility -> Warn me when web sites try to redirect or reload the page).
However that option not always works, specially with newer sites; also that is a Firefox option only, which apparently you already knew about.
In the meantime, you (and the rest of us) are out of luck while using Safari.
The ideal would be those sites to implement an AJAX form of communication that informs the user that there’s new content. All in all, it’s a series of hacks over a static protocol that maintains no “session” by design.