Using a different browser (Firefox or Chrome) may help with this. I find that they make the links in the HM window “unclickable”, although the banner ads/front page ads still work fine.
Other than that, you’ll just have to remember to save the text files for your characters. It’s always a good idea as all sorts of things – Flash updates, drive cleaners, etc – can wipe away all your hard work.
If you’re not sure how to do that, there’s a tutorial here: