Same here. Vista & Firefox. My messages are loading just fine.
I was using Ice Dragon and it too works fine with Ancestry as does Comodo Dragon & also Pale Moon. Very seldom do I have a problem with Ancestry. Only this last 2 days have I occasionally had a slight problem with a page loading, the first of that problem in a long time. (but I know that Ancestry is switching over to the new look and I presume that is part of why I now have the occasional slow load... not a problem for me, I'm patient.)
With Firefox and the other above noted browsers, I only have AdBlockPlus as a plugin. Nothing else. I uninstall or turn off all other plugins. No problems with any website I use. Same for my husband's computer with Win 7 & my other laptop with Win 8. I have them all set up the same, same browsers. No problems with any of them.