I've just added the applet via ppa. It's very nice on my panel. @George Edison, thank you!

This extension has a page here and registered users of stackapps.com can vote for it. I did.

After Jorge Castro's comment I tried more and found that it was my bad. Now it is time to clean, shorten my question and answer my-dumb-self.

@Jorge Castro: For the first part: I'll try to check again from my side even if I don't know what to do to check. For the second part: You are right. Corrected.

1.0.1 is even better. I was not aware of the new version for four days. My bad.

Sounds logical.

Thanks a lot; I love this extension. A reminder (maybe two) for the new users to be on the safe side: When I installed the extensiom, it appeared on the right uppermost part of the window, just near the search bar, somewhat different than what we see in the screenshot. First you have to enter your user ID via Preferences of the extension. User ID is the number you see in the url when you visit your profile page on askubuntu.com.