Emoticons tab focuses when updated plugins to install
When there are updated plugins to install there is a popup question if you want to update those plugins. When clicking ok normally one would be presented with the Available tab in the plugin manager where you can update the plugins. But if you have the Emoticons plugin installed this tab will be prestented instead so you will manually have to go to the Available tab and then update.
I assume it's hardcoded to present the second tab which normally is the Available tab, but Emoticons have been placed in between Installed and Available.