Mozilla is not planning any further security and stability updates for Firefox 2, and recommends that you upgrade to Firefox 3 as soon as possible. It's free, and your settings and bookmarks will be preserved.

Also, the Phishing Protection service will no longer be available for Firefox 2 users. Firefox 3 offers a free Phishing and Malware Protection service, which will continue to protect you from online scams and attacks.
OCSP (Online Certificate Status Protocol) is a feature that checks the validity of security certificates used by secure (https) sites. In Firefox 2, if you enable OCSP and the OCSP service you chose is malfunctioning, Firefox will give you an OCSP error message.

{content label=suggestFx3}

In Firefox 2, the only way to stop these error messages is to disable OCSP.

1. At the top of the Firefox windowOn the menu bar, click on the ToolsFirefoxEdit menu, and select Options...Preferences....
2. Select the Advanced panel.
3. Click the Encryption tab.
4. Click Verification.
5. Select Do not use OCSP for certification validation.
6. Click OK to close the Verification window.
7. Click OK to close the Options windowClick Close to close the Preferences windowClose the Preferences window.

With OCSP disabled, you should not receive any more OCSP errors.