I use many tabs on various sites for business and recently went to a site that appears to keep opening tabs that can only be seen in Task Manager. I belive this has been happening before as when closing Firefox and watching Task Manger there always seemed to be a lot more app lines than tabs open. It happened again today with just a few tabs open so I was able to detect the real culprit. https://www.sharecast.com/ I have popups blocked in settings with a few exceptions ( does not include the site that I have found is causing issues) Example: I had 15 tabs open. Opened a new tab for the above site. In no time at all Task Manger is showing 23 then jumped to 36. the tab(s) can increase the firefox total memory used from .8GB to 2.6GB. CPU .7% to 70%+ I am sure this is not the only site doing this. So my question: Is there a setting that will stop this happening whilst still using the site? Just tested using Edge and the same happens. Might just have to refrain from using the site. Thanks Peter