Firefox ერთობის განხილვა

I just reinstalled Firefox after resetting my computer so I was clicking around and making some personal adjustments. Now, everytime I add a tab it also open a window for that tab. Which is very annoying because I often use a lot of tabs at the same time for my research. I don't know why this has happened, maybe I accidentally clicked on something in the setting? I’m not very good with computer so I really need help with this. Thanks!

I have an issue with grouped tabs but I know where the grouped tabs are, I click the arrow facing down and it doesn't show the grouped tabs that I had, I don't know if it's because I turned off my PC when firefox was still open but I do that most of the time, when I opened firefox it said that it couldn't restore previous session or something like that and next thing I notice is that all my grouped tabs are gone. Is there a way to get them back?