So This early morning, after a few hours of use. these things happened: 

Hello, So This early morning, after a few hours of use. these things happened: 1. i couldnt close a tab while im in that tab at the same time, i have to be at another tab while right clicking the tab i cant to open. this happened only on non-private window (it works on private window i had). i restarted fire fox. done fixed. 2. then a few minutes after i shut down my laptop. i coulndnt open it, getting error code: error Code: 0x00000000 i deleted and reinstalled firefox and here i am. I'm wondering if anyone can explain what happened, why and how i could prevent for the future. Thank you.