Another Tips of Open in New Tab

This is assume that you're using Firefox Browser.
You can do double click on an empty space on the Tab Bar, it will open and empty New Tab. I'ts easier than pressing Ctrl + T since your hand is far away from keyboard.

Also try:
Middleclick on a Bookmark on your Personal Toolbar will open your bookmark in a New Tab
MiddleClick on a folder that will open all the bookmarks in the folder in a new Tab (not recommended if you have numerous bookmarks)
Hold down the Shift/Ctrl and right click on the "View Image" or "View Backround Image" to open the image in New Tab or New Window.