There are two ways Firefox can log you into a site automatically:

(1) Persistent cookie keeping you logged in from session to session
(2) Saved username and password Firefox fills in for you

On the first one, you can change a site's cookie permissions so that it can only set session cookies. (For example, you can do this on the Page Info dialog: right-click a page on the site > View Page Info, then Permissions)

On the second one, you can delete any saved login and instruct Firefox not to save logins for that site.

However, I can't think of any way to automatically connect these permissions to your bookmarks.

If you would like more information on the manual approach, please post back with any specific questions.

Also make sure to log off and close open tabs before closing Firefox to prevent Session Restore from storing cookies that might remember you.

There are other things that need your attention.

Note that your System Details List shows multiple Flash plugins.

1. Shockwave Flash 11.9 r900
2. Shockwave Flash 11.7 r700

You can find the installation path of all plugins on the about:plugins page.

You can check the Flash player installation folder for multiple Flash player plugins and remove all (older) version(s) of the plugin (NPSWF32) and (re)install the latest Flash player.

• (32 bit Windows) C:\Windows\System32\Macromed\Flash\
• (64 bit Windows) C:\Windows\SysWOW64\Macromed\Flash\