As shown above, what's does the number in the tab refer to? The number of "articles" on the page?
As you can see, this doesn't work with Chrome (haven't tested Safari). Perhaps that's a limitation of the browser itself though?
Also, this number goes in away in IE9 when you:
1. Login to My.SolidWorks
2. Click any article
3. Click the browser's back button
4. Click on another article
5. Click the browser's back button
If you go to another article, it comes back, then it disappears again if you click the browser's back button again. If you click the Home button, the number will be displayed.