In opera you have pinned 10-15 tabs, then decide to watch a video on your second monitor so, u r open a new tab and then drag in it to the second monitor, so this tab becomes a window. After a while you need to restart you computer, you are closing your windows with pinned tabs and then you are fuck*d, because opera is not close, right you have that window that you watch a video or something else on your second monitor, and you have to close it too. What that means? It means that when you start opera again will open only your last session/last tabs were closed…. And to have you main windows you use open you have no option, so you have to go to history and reopen every tab and to pin it again and blabla. This should be fixed/added as feature or idk, but it’s annoying..
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Article Source: Comment on Opera developer 43.0.2423.0 update by beBoss