I was having the same problem. Turns out it was Google Gears that was blocking the Twitter button on GReader. To fix this, I selected Tools~Gears Settings and then removed all references to www.google.com. After a Firefox restart it worked like a charm. Using: Firefox 3.0.8 GM 0.8.20090123.1 Thanks! <p>I was having the same problem. Turns out it was Google Gears that was blocking the Twitter button on GReader. To fix this, I selected Tools~Gears Settings and then removed all references to <a href="http://www.google.com">www.google.com</a>. After a Firefox restart it worked like a charm.</p> <p>Using: <br />Firefox 3.0.8 <br />GM 0.8.20090123.1</p> <p>Thanks!</p> 2009-04-15T18:10:58Z 10169 Script 111236 20635 2009-04-15T18:10:58Z 87028