Using the TabMixPlus plugin for Firefox or Chrome, I can right click a page and choose "reload every..." and I could choose an interval.
I'd prefer not to install a plugin unless I really have to, and I am aware that you can type special things into Chrome's address bar.
This makes me think that something like this typed straight into the address might work:
I haven't managed it yet, but still don't want to rule it out as a possibility.
Is this possible?