On start-up the Firefox browser shows a list of articles/topics that is referred to as Pockets. I clicked on one from Orion Magazine this morning and after the article was up for about 30 seconds a graphic appeared that showed a large metal looking sphere and was suppose to augment the article. This graphic completely locked up my computer. I am running an ancient iMac, mid-2007, and it took bringing down my wi-fi network and a little frustration to get my computer unfrozen. Please take down this article.