The problem is that mozilla:pkix module with stricter certificate verification is enabled in Firefox 3 1. After this problem occurs, the best solution is to prompt the website to update the self-signed certificate for visitors and update it. However, there is something wrong with the self-signed certificate of the oracle console, so there is no better way for the time being.

But in terms of experience, it may be better and more efficient for you to use splus for database management. However, for general operations such as user creation and tablespace creation, it is enough to use PLSQL tools directly.