How to use self-signed Certificate or No-Check-Certificate in Browser ?

Folks,
Hello. I am running Oracle Database 11gR1 with Operaing System Oracle Linux 5. But Enterprise Manager Console cannot display in Browser. I do it in this way:
[user@localhost bin]$ ./emctl start dbconsole
The command returns the output:
https://localhost.localdomain:1158/em/console/aboutApplication
Starting Oracle Enterprise Manager 11g Database Control ... ...
I open the link https://localhost.localdomain:1158/em/console/aboutApplication in browser, this message comes up:
The connection to localhost.localdomain: 1158 cannot be established.
[user@localhost bin]$ ./emctl status dbconsole
The command returns this message: not running.
[user@localhost bin]$ wget https://localhost.localdomain:1158/em
The command returns the output:
10:48:08 https://localhost.localdomain:1158/em
Resolving localhost.localdomain... 127.0.0.1
Connecting to localhost.localdomain|127.0.0.1|:1158... connected.
ERROR: cannot verify localhost.localdomain's certificate, issued by `/DC=com/C=US/ST=CA/L=EnterpriseManager on localhost.localdomain/O=EnterpriseManager on localhost.localdomain/OU=EnterpriseManager on localhost.localdomain/CN=localhost.localdomain/[email protected]':
Self-signed certificate encountered.
To connect to localhost.localdomain insecurely, use `--no-check-certificate'.
Unable to establish SSL connection.
A long time ago when I installed Database Server Oracle 11gR1 into my computer, https://localhost.localdomain:1158/em in Browser comes up this message:
Website certified by an Unknown Authority. Examine Certificate...
I select Accept this certificate permanently. Then https://localhost.localdomain:1158/em/console/logon/logon in Browser displays successfully.
But after shut down Operating System Oracle Linux 5 and reopen the OS, https://localhost.localdomain:1158/em/console/logon/logon in Browser returns a blank screen with nothing, and no more message comes up to accept Certificate.
My browser Mozilla Firefox, dbconsole, and Database Server 11gR1 are in the same physical machine.I have checked Mozilla Firefox in the following way:
Edit Menu > Preferences > Advanced > Security > View Certificates > Certificate Manager > Web Sites and Authorities
In web sites tab, there is only one Certificate Name: Enterprise Manager on localhost.localdomain
In Authorities tab, there are a few names as indicated in the above output of wget.
My question is: How to use self-signed certificate and no-check-certificate in Mozilla Firefox for EM console to display ?
Thanks.

Neither problem nor solution do involve Oracle DB
root cause of problem & fix is 100% external, detached, & isolated from Oracle DB.
This thread is OFF TOPIC for this forum.

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