gmail or opera crash

That is one of the bug of opera browser. Try to upgrade your opera browser into its latest version. I am currently using the latest version of opera and I am satisfied with it. You can also use another browser for the meantime like mozilla and IE. Have a nice day and God speed!

try another browser if gmail works maybe opera not works.

It dependents , if your mail was normal like everyday the problem is in Opera. But, if your mail is full most of the browsers accept Firefox but it happen with Firefox sometimes too will just crash because they can't solve that many problems. My suggestion is that you try to log in from another browser maybe IE or Firefox and if everything is all right you need to reinstall your opera or chose another browser but if it happens again you need to ask Gmail help support.