Google URL Shortener by Goo.Gl Using Firefox Addon

Goo.gl is new shortener link service of Google to create short URLs that can be easily shared, tweeted, or emailed to friends.

To use Goo.gl, you must install the Google toolbar on your computer. But, if you are using Firefox, you can use a Firefox addon to shortened link in goo.gl with your Firefox without installing the toolbar.
The first, you need install addon goo.gl lite for your Firefox.
https://addons.mozilla.org/en-US/firefox/addon/55308

after installed this addon, restart Firefox and right click in above section to open customize
Drag the Goo.gl icon to Firefox toolbar.

it’s look like

Go to the web page need to shorten and click to Goo.gl icon, the link will be shorten and copied to clipboard.

You just need go to blog, forum,… and paste, the link has shortened will display.