The issue is likely because you have 3rd Party Cookies turned off in your Firefox. The quickest way to fix this it to either turn on 3rd Party Cookies or add an exception for shareaholic.com in your cookie settings (found under Preferences -> Privacy):

We’re looking into ways where 3rd Party Cookies won’t be required. If you have suggestions, please let us know too!

Today we’re pleased to announce the release of the latest version of Shareaholic for Firefox – v2.0.3. This is our first 2.0 release, and a major update!

You can get the latest version of Shareaholic here, or if you already have Shareaholic installed, simply wait for Firefox to automatically notify you of the update.

New in Shareaholic for Firefox v2.0.3:

• Major performance improvements; now 40% lighter!
• Completely revamped options menu

  
  

• Posting to Twitter is even quicker. We separated Twitthat and Twitter services.
• Now includes a Mac specific Toolbar Icon
• You can now custom order the services list
• Easy Toggle for Stats Monitor Compete stats

We love feedback!

Do let us know what you think, and how we can improve. We continue to improve Shareaholic based on your valuable feedback.

Note: if you use the NoScript for Firefox Add-on, please make sure you read this and update your white list.

We’re very happy to announce our integration of Google Buzz into all of our products (it is already live in Shareaholic for Chrome, and will be rolled out to Firefox very soon).

We worked hard with the team at Google to bring you this awesome integration, and we hope you enjoy using Google Buzz from Shareaholic as much as we do! Lots more to come.

If you would prefer to post to Google Buzz directly via a bookmarklet, you can do that as well:

Google Buzz
     Try it: Click and drag the link above onto your Bookmarks Bar

If your bookmarks bar isn’t showing, you might have to enable it via your browser settings.