It is easy to feel overwhelmed if you are opening multiple links from a single page. Depending on your situation, you may be opening five or more links, and it is annoying to have to move back to your original tab each time you open a link. Luckily for you, there is a quick and easy about:config hack that can force links to open in background tabs, which means you won’t be disturbed from your browsing.

In order to force all links that open in a new window to load in a background tab, type about:config in the URL bar and change browser.tabs.loadDivertedInBackground to true.

Force links to open in the background [Lifehacker]