What can you do to access Password options in the Security window if your Firefox browser won't display the options?

I want to stop and prevent my Firefox browser from saving website passwords, which I understand can be done using the Security window.
https://support.mozilla.org/en-US/kb/security-and-passwords-settings?esab=a&s=passwords&r=1&as=s
Unfortunately, once opened, the Security window doesn't display the password options check boxes for me even though that's what the support site says the browser should do it. Neither can I get the Security window to extend to display the other potential options, which leads to me think there aren't any other options.
Any ideas what I can do about this problem? I'm running Mac OS 10.8.5 and Firefox 30.0. Thanks for any advice!

(The following definitely relevant to Windows, but I'm not sure about Mac)
Another thing Safe Mode does is ignore the localstore.rdf file, which contains toolbar/window/dialog layout information and sometimes can become corrupted. To eliminate localstore.rdf as a factor, you can rename the file and customize from scratch.
Open your current Firefox settings (AKA Firefox profile) folder using either:
* "3-bar" menu button > "?" button > Troubleshooting Information
* (classic menu bar) Help > Troubleshooting Information
* type or paste '''about:support''' in the address bar and press Enter
In the first table on the page, click the "Show in Finder" button.
Leaving that window open, switch back over to Firefox and Exit/Quit
Pause while Firefox finishes its cleanup, then rename '''localstore.rdf''' to something like localstore.old
Start Firefox up again. Any improvement?

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