I'm not sure I understand the change, so let me mention a few things and you can reply with comments and clarifications. How are you directing links to new tabs: do you use one of these methods? * right-click > Open Link in New Tab * Ctrl+left-click * middle-click (using a mouse scroll wheel) Other issues: * Is Firefox's tab bar not showing or behaving strangely? (Please describe in more details if applicable.) * If the problem is that the Windows Task Bar is not working the way it used to, check the ''last'' setting on the Tabs panel of the Options dialog: "Show tab previews in the Windows Taskbar" to see whether that is what got turned off. * If the problem is that Google results used to automatically open in a new tab but now they open in the same tab, you need to select "new window" in Google search preferences: https://www.google.com/preferences