Thanks for posting. I tried the JavaScript in Google Chrome and it didn't work (see attached macro screenshot). FYI: I added the alert just to make the sure the macro ran.
I checked the code and there are loads of buttons/links with the "action_button" class. So I'm not sure how to target this one specifically. If it's useful, the button I'm trying to click is the first button on the page (and always will be).
I wish I could provide the full page HTML, but it's for a client I'm working with. Do you have any other suggestions?