While in Edit Mode in Moodle - page content does not render at all, but I am able to display the underlying HTML code. Happens only after upgrade to Firefox 11.0.

While in edit mode in the Moodle course management system, the Page Content window should display the page as it will appear to the user. If you click on the "Edit" button, you are able to view the HTML code for the page. However, when you return to the normal display mode, the page is blank. This has occurred after the upgrade to Firefox 11.0. Page is normally rendered in Internet Explorer.

A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls
See also:
*http://kb.mozillazine.org/Error_loading_websites
*https://support.mozilla.org/kb/Error+loading+web+sites

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