Wikipedia:Snap Links tutorial

Snap Links is a mass tab loader add-on for the Mozilla Firefox and Google Chrome browsers. It auto loads links into tabs when the user holds down the right mouse button and drags a selection rectangle over those links (an action called "lassoing"). You create a rectangle, then release the right mouse button, then the rectangle disappears, and the tabs open up.

A "tab" is a window opened within a web-browser. Each tab independently displays a web page (such as a Wikipedia article). Tabs are especially useful for browsing and editing multiple Wikipedia pages.