Help for enable SSL 3.0 and disable TLS 1.0..

sure in firefox 23....

Current Firefox no longer have a user interface setting to disable TLS or SSL3, but you can make the change on the about:config page. Future Firefox versions will support higher TLS versions (1.1 and 1.2) and both SSL3 and TLS 1.0 are enabled by default.
You can set the security.tls.version.min and security.tls.version.max prefs to 0 to disable TLS (0 means SSL3)

See also:

• http://kb.mozillazine.org/kb.mozillazine.org/security.tls.version.*

0 means SSL 3.0, 1 means TLS 1.0, 2 means TLS 1.1, etc.

• Bug 733632 - Remove TLS version UI (Options > Advanced > Encryption > Protocols)

Please DO NOT comment in bug reports: https://bugzilla.mozilla.org/page.cgi?id=etiquette.html

Rather than use individual checkboxes, Firefox now operates over a range of SSL/TLS protocols. These settings are accessed using the about:config preferences editor.

Lowest Acceptable Protocol: security.tls.version.min (default SSL3.0 = 0)
Highest Allowed Protocol: security.tls.version.max (default TLS1.0 = 1)

To modify:

(1) In a new tab, type or paste about:config in the address bar and press Enter. Click the button promising to be careful.

(2) In the Search box above the list, type or paste tls and pause while the list is filtered

(3) To disable SSL3 and requires TLS of one flavor or another, double-click security.tls.version.min and enter the desired value:

• 0 = SSL 3.0 okay
• 1 = at least TLS 1.0
• 2 = at least TLS 1.1 See WARNING below

(4) To disable TLS of one flavor or another, double-click security.tls.version.max and enter the desired value:

• 0 = up to SSL 3.0
• 1 = up to TLS 1.0
• 2 = up to TLS 1.1 See WARNING below

WARNING: According the following article, selecting TLS 1.1 may prevent connections to older servers from working: http://kb.mozillazine.org/Security.tls.version.*