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od Uživatel Firefoxu - 18e274 dne Zář. 29, 2017 · trvalý odkaz

It adds a few new columns in the message list which is brilliant. Now you can finally have a proper thread display.
But then it messes with the message display window/pane. It uglifies the header view, changes the quick filter button display and what not. I had to uninstall it.