This problem seems to be a LOT of missing browser CSS. The browser's chrome area is just being displayed using the default font and default layout of the tags used.
not in my case. I get the problem, even in private browsing mode.
However, in private browsing mode, I need to navigate to a page with a large icon, so the tabs bar (or how it's called) grows vertically.
Right now, as a workaround, I downgraded to 10.5.10
Thanks for reporting @agiteg and @S0AndS0! This looks like a duplicate of #40690 (closed), so I'm going to tentatively close this ticket for now (however I've linked to it in the main ticket for reference).
@brunoais I'm not sure what's causing the tall tabs issue, but I've seen similar reports elsewhere. It may need split out into a separate ticket.
However, in private browsing mode, I need to navigate to a page with a large icon, so the tabs bar (or how it's called) grows vertically.
Can you explain this part to me in a little more detail please?