[Un]read

Z 4 z 5 gwězdkow pógódnośony

wót ryaske dnja Okt. 15, 2008 · trajny wótkaz

Does what you describe! Was happy to find it easily via a google search.

But .. it would be 100% amazing if this extension could keep focus on your current message instead of removing focus and returning to the top of the messages. But, thats what changing unread/read manually via the dropdown does anyway.

SO I give it 4 stars. Best it could be, but not perfect.