Firefox 3.6 has introduced a new tab behaviour, where new tabs are opened next to your currently selected tab, while Firefox 3.5 and older would open new tabs at the end of all your tabs.
If you don’t like this new behaviour, you can change it back to the way it was. Simply follow these steps:
- Go to about:config in the address bar
- Search for browser.tabs.insertRelatedAfterCurrent
- Double click the value to change it from true to false
- Done!
Enjoy surfing the way you are used too.