This is a list of the most common mouse shortcuts in Mozilla Firefox.
Command Shortcut
Back Shift+Scroll Down
Forward Shift+Scroll up
Zoom In Ctrl+Scroll up
Zoom Out Ctrl+Scroll down
Close Tab Middle-click on Tab
New Tab Double-Click on Tab Bar
Open in Background Tab* Ctrl+Left-click
Middle-click
Open in Foreground Tab* Ctrl+Shift+Left-click
Shift+Middle-click
Open in New Window Shift+Left-click
Copy Tab or Bookmark Ctrl+Drag
Reload (override cache) Shift+Reload button
Save Page As Alt+Left-click
Scroll line by line Alt+Scroll