When clicking to open the Minecraft java launcher, the screen is a plain grey screen that you cant exit out of you will have to restart your computer for the tab to go away, if there isnt a grey screen a tab usually just doesn't respond.
Linked issues
Comments 1
This appears to be a duplicate of MCL-16049 which hasn't yet been resolved. If you have any additional information to provide regarding this issue, feel free to comment on the parent ticket. If you feel that this issue is affecting you, feel free to vote for the duplicated ticket, to give Mojang a basic idea of how many people are impacted by the problem. Just to further inform you, this will not determine how quickly the bug gets handled or fixed.