Why, when I open a website, do I get one or more unwanted websites opening, and how do I stop it. Samsung laptop, Windows 8.1, in South Korea.

• You can start Firefox with every addon turned off by click the menu button , click Help and select Restart with Add-ons Disabled.

If you don't have problem in safe mode, restart Firefox and uninstall every addon you don't need. To learn how to do it read Disable or remove Add-ons

Your System Details shows;

Installed Plug-ins

Adobe Shockwave for Director Netscape plug-in, version 12.1.1.151 Adobe Shockwave for Director Netscape plug-in, version 12.0.5.146

Having more than one version of a program may cause issues.

You may have mal-ware. But try this first;

Go to the Mozilla Add-ons Web Page {web link} (There’s a lot of good stuff here) and search for what you want. a good add / pop-up blocker.

Troubleshoot Firefox Issues Caused By Malware {web link}