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

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config

I went to About:config

Clicked ill be careful to continue

Searched Browser.link.open_newwindow

set Browser.link.open_newwindow to 1

And it is still doing the same thing I go on https://www.youtube.com/ click a video I see and instead of opening it on the tab im on it opens a new tab for it

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

• Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
• Do NOT click the Reset button on the Safe Mode start window

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

I went into Safe Mode and the Problem Went away How do I figure out which Extension is the one causing the problem?

WAIT THE PROBLEM IS FIXED THANK YOU!