Why will Kerberos enabled SSRS instances will not load in Firefox

We have 10 SSRS (SQL Server Reporting Services 2008 R2 SP1) instances. 6 are using Kerberos while the others are using NTLM. Firefox will load Report Manager under NTLM, but not with Kerberos. Until last week Firefox would load both, but a recent security update from FF caused the conflict. If I change an instance using Kerberos to NTLM, FF will load Report Manager. Once I revert back, I see either a blank page or an error:
XML Parsing Error: no elemet found
Location: http://<domain name>/Reports/Pages/Folder.aspx
Line Number 1, Column 1:
This started impacting all users of Firefox last week with our company. We had no issues loading RS under Kerberos before this, and we would like to know how to resolve the conflict. Please advise.

The pictures load OK for me, with twitpic on display, click on the site identity button (for details on what that is see [https://support.mozilla.com/kb/Site+Identity+Button]) and then on More Information. This will open up the page info dialog.
First select the Permissions panel, make sure that "Load Images" is set to allow (selecting Use Default should also work)
Next select the Media panel, then click on the first item in the list. Use the down arrow key to scroll through the list. If any item has the option "Block images from (domain name)" selected, de-select the option.
This should hopefully resolve your issue, but also see https://support.mozilla.com/kb/Images+or+animations+do+not+show
Some add-ons can also block images, for example if you have AdBlock Plus installed, make sure that you have not accidentally created a filter to block the images.

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