Via Webtools Collection I found a great Firefox extension: Easycomment.
Easycomment gives you the power to make one click comments on WordPress blogs.
The only thing you have to do is to fill out your account information for the different blogs where you post comments, and then you can post comments on all those different blogs within one click! 
This is how the extension works:
1) Download Easycomment from the project page.
2) Install it and restart firefox.
3) Fill in the properties of easy comment by double clicking the easyComment button on the right in the Firefox status bar:
4) Then go to one of your favorite blogs, as you can see the comment box is empty:
5) Double click on the easyComment button:
6) As you can see, the comment box is now filled with the data we put in the preferences dialog earlier:
I’m sure this will save you much time in posting comments on your favorite blogs!
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