Starting with Firefox 3.6, when a new tab is opened, Firefox does not automatically switch to it but keeps the current tab active. But you can change the settings to make it switch to the newly opened tab as soon as it is opened. This is how :
- Open Mozilla Firefox.
- Select from the menu Tools → Options to open the Options dialog.
- Check the checkbox labeled When I open a link in a new tab, switch to it immediately.
- Click OK to save the settings.
Now whenever you open a new tab, Firefox would switch to it automatically.