@Kasumikoo
I have the same issue. I managed to find this more recently posted Reddit post about it. May have some ways for you to fix it, hasn't seemed to work for me yet though, and it appears we aren't the only ones with this issue.
https://www.reddit.com/r/OperaGX/comments/1r393nq/opera_page_crashed_on_all_tabs_and_widgets/