|User since||July 19, 2008|
|Number of add-ons developed||0 add-ons|
|Average rating of developer's add-ons||Not yet rated|
Rated 2 out of 5 stars
It's needless. You can only mark all messages in the currently viewed folder.
The standard shortcut CTRL-SHIFT-C is much faster and easier to use.
What i was searching for is a button or shortcut to mark definitely ALL messages read.