Para a forma que eu utilizo - sem uso do Analytics, funciona perfeitamente. Você entra na página que deseja encurtar a URL e apenas clica no botão "G" e ele, automaticamente, encurta e copia a URL. Você só precisa CTRL+V no lugar que quiser posta-la.
Ele copia a URL no padrão: https://goo.gl/T0dQhi e não goo.gl/T0dQhi. Ou seja, ele coloca o https:// antes. Fica essa informação caso lhe seja útil.
A URL encurtada não aparece no site goo.gl, como uma URL que VOCÊ encurtou. Então, você não terá acesso a analytics ou algo do tipo.
Almost works, except for the logo in the URL bar which claims that the URL is not correct (like for the others). Right-clicking the tab works Right clicking the page body works Right-clicking the URL selected URL (via Ctrl-A or with the mouse) does not show the shortening icon, probably for the same reasons as for the URL bar.
I guess the issue is with the lack of "http://" - this should be fixed, I do not want to change this behavior in about:config.
Zero stars. No matter what URL I try, all I seem to get is "The url in the urlbar is not a valid one".
It works for this page on which I typing a review, so it looks like the "http://" is still required (explained as a work-around by an earlier reviewer), which suggests that this add-on has been broken since at least October 2011, and it's now May 2012.
Expands only goo.gl shortened urls. Useless In 2011 and Firefox 4, thousands of extensions but not ONE url expander, unshortener (whatever you name it), there were some for Firefox 3.x, none updated. This purpose seems essential, and scripts I've found here and there are mostly Tweeter restricted. So, if you are skilled and are searching for a useful extension to code, go ahead, please !!