What is in these new pages? Ads? You may have ad / mal-ware. Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article. Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up. ---------------------- '''[https://addons.mozilla.org/en-US/firefox/addon/adblock-plus/ Adblock Plus]''' {web link} Blocks annoying video ads on YouTube, Facebook ads, banners and much more. Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable). '''[https://addons.mozilla.org/en-US/firefox/addon/adblock-plus-pop-up-addon/ Adblock Plus Pop-up Addon]''' {web link} Adblock Plus Pop-up Addon extends the blocking functionality of Adblock Plus to those annoying pop-up windows that open on mouse clicks and other user actions. Forum; '''[https://adblockplus.org/forum/ Adblock Plus Homepage]''' {web link}

On Linux malware is not really present. You either have an extension that causes this or you visit website that open such a pop-up window. See: *http://kb.mozillazine.org/browser.link.open_newwindow *1: current tab; 2:new window; 3:new tab; For links opened via JavaScript you can look at this pref: *http://kb.mozillazine.org/browser.link.open_newwindow.restriction