Hi, it is a war with adblockers and websites trying to get there ads through. You can try using : *https://addons.mozilla.org/en-US/firefox/addon/noscript/ Note it can break sites. Use Ublock Origin (as you do not mention any add-ons nor was any information sent for me to know) *https://addons.mozilla.org/en-US/firefox/addon/ublock-origin/ It can also break pages. Open permissions in the Information and see if can un-check pop-ups *https://support.mozilla.org/en-US/kb/firefox-page-info-window Please let us know if this solved your issue or if need further assistance.