See this article : http://www.dria.org/wordpress/archives/2008/05/06/635/

Firefox 3.6 gives me a pop up that tells me I am entering or leaving a site with a secure server. It is a SETTINGS under Warning Messages in the Security tab in the options window. When the SETTINGS button is pushed, a number of check boxes allow for different settings. I cannot find it in Firefox 8.

I think this feature no longer exits on Firefox . But you can get this feature manually.

Type about:config on the location bar and search for

security.warn_entering_secure

security.warn_leaving_secure

Double click it to change it's value to true.

The settings for the 5 Warning Messages was removed from the Security section in Firefox 4 and newer versions; those settings need to be accessed thru about:config now. It sounds like you are looking for the first one and the third one in the list below "Former settings in Firefox 3.6 on the Security panel"

See: http://kb.mozillazine.org/About:config

1. type about:config in the URL bar and press the Enter key.
2. If you see a warning, accept it (promise to be careful)
3. Filter = security.warn_
4. double-click the pref in the lower panel on the about:config display to toggle to true or false according to the descriptions in the following (scroll down to security.warn to see those particular prefs)
   • http://kb.mozillazine.org/About:config_entries#Security.

Former settings in Firefox 3.6 on the Security panel
Show a warning dialog when:

• I am about to view an encrypted page
  • pref: security.warn_entering_secure
• I am about to view a page that uses low-grade encryption
  • pref: security.warn_entering_weak
• I leave an encrypted page for one that isn't encrypted
  • pref: security.warn_leaving_secure
• I submit information that's not encrypted
  • pref: security.warn_submit_insecure
• I'm about to view an encrypted page that contains some unencrypted information
  • pref: security.warn_viewing_mixed

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Not related to your question, but...

You may need to update some plug-ins. Check your plug-ins and update as necessary:

• Plug-in check --> http://www.mozilla.org/en-US/plugincheck/
• Adobe Shockwave for Director Netscape plug-in: Installing (or Updating) the Shockwave plugin with Firefox
• Adobe PDF Plug-In For Firefox and Netscape: Installing/Updating Adobe Reader in Firefox
• Shockwave Flash (Adobe Flash or Flash): Updating Flash in Firefox
• Next Generation Java Plug-in for Mozilla browsers: Installing or Updating Java in Firefox

Thanks Safebrowser. Why was it made so complicated?

There were many, many questions involving those settings in prior versions of Firefox on the Security panel, users were changing them without realizing the consequences, and then complaining about the warnings that they received.

The developers made the decision to remove those settings from the Security panel, but the about:config items remain for users to change the preferences if they so choose.