"Following are a few time saving tips on using your mouse scroll wheel in Firefox.
1. Use the mouse scroll wheel to zoom a page:
To zoom into a page, hold the Ctrl key and turn the scroll wheel up or away from you. Likewise, to zoom out, hold the Ctrl key and turn the scroll wheel down or towards you.
2. Use the mouse scroll wheel to scroll through tabs:
Most Firefox users end up using a lot of tabs simultaneously. When that’s the case, one can see an arrow at either end of the tabs to let you scroll through the tabs and view the hidden tabs. A much easier way is to place your mouse cursor anywhere on the tab bar and scroll your mouse wheel up and down to scroll through the opened tabs.
3. Use the mouse scroll wheel to open hyperlinks in a new tab:
The usual way of opening hyperlinks in a new tab is by right-clicking on the the link and choosing ‘Open Link in New Tab’. Here’s a much faster but a relatively unknown way of doing it. Just click on the link with the scroll wheel. The link will open in a new tab.
Bonus Tip: You can even click on the Home button or the Forward/Back button to open the respective url in a new tab.
4. Use the mouse scroll wheel to close tabs:
Just place your mouse cursor over a tab and click with the scroll wheel to close a tab. This I think is the most efficient and faster way to close a tab rather than clicking on the small cross on the tabs.
5. Use the mouse scroll wheel to go forward or back web pages:
The scroll wheel can be used as an alternative to using the Forward (Go forward one page) and Back (Go back one page) buttons on the toolbar. Hold the Shift key and rotate the wheel up to view the next page or rotate down to see the previous page."
http://www.techspikes.com/2008/08/5-little-known-ways-to-use-your-mouse-wheel-to-do-more-in-firefox/
1. Use the mouse scroll wheel to zoom a page:
To zoom into a page, hold the Ctrl key and turn the scroll wheel up or away from you. Likewise, to zoom out, hold the Ctrl key and turn the scroll wheel down or towards you.
2. Use the mouse scroll wheel to scroll through tabs:
Most Firefox users end up using a lot of tabs simultaneously. When that’s the case, one can see an arrow at either end of the tabs to let you scroll through the tabs and view the hidden tabs. A much easier way is to place your mouse cursor anywhere on the tab bar and scroll your mouse wheel up and down to scroll through the opened tabs.
3. Use the mouse scroll wheel to open hyperlinks in a new tab:
The usual way of opening hyperlinks in a new tab is by right-clicking on the the link and choosing ‘Open Link in New Tab’. Here’s a much faster but a relatively unknown way of doing it. Just click on the link with the scroll wheel. The link will open in a new tab.
Bonus Tip: You can even click on the Home button or the Forward/Back button to open the respective url in a new tab.
4. Use the mouse scroll wheel to close tabs:
Just place your mouse cursor over a tab and click with the scroll wheel to close a tab. This I think is the most efficient and faster way to close a tab rather than clicking on the small cross on the tabs.
5. Use the mouse scroll wheel to go forward or back web pages:
The scroll wheel can be used as an alternative to using the Forward (Go forward one page) and Back (Go back one page) buttons on the toolbar. Hold the Shift key and rotate the wheel up to view the next page or rotate down to see the previous page."
http://www.techspikes.com/2008/08/5-little-known-ways-to-use-your-mouse-wheel-to-do-more-in-firefox/