Why is HTML content missing on some websites with Firefox 13?

I just reinstalled Kubuntu 12.04 and I use Firefox 13 now. For some strange reason some HTML content isn't displayed. For example on this page, the code block after "This is test.module" is just gray:
https://drupal.org/node/1331094 The same happens on other sites. I haven't been able to figure out a pattern so far.
I can confirm, that the missing content ''is'' in the source code.

Additionally you could also check in [https://support.mozilla.com/en-US/kb/Safe%20Mode Safe Mode]. Safe mode disables the installed '''Extensions''', and themes ('''Appearance''') in '''Tools''' ('''Alt''' + '''T''') > '''Add-ons'''. Hardware acceleration is also temporarily disabled - the manual setting is '''Tools''' > '''Options''' > '''Advanced''' > '''General''' > [https://support.mozilla.org/en-US/kb/Options%20window%20-%20Advanced%20panel?as=u '''Use hardware acceleration when available''']. All these settings/options/add-ons can also be individually or collectively disabled/enabled/changed in Firefox normal mode to check if an extension, theme, option or hardware acceleration is causing issues. Disabling/enabling hardware acceleration, and some types of add-ons in normal mode may require a Firefox restart.
[http://support.mozilla.com/en-US/kb/Uninstalling+add-ons Uninstalling Add-ons]
[http://kb.mozillazine.org/Uninstalling_toolbars Uninstalling Toolbars]
[https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes Troubleshooting Extensions and Themes]
[http://kb.mozillazine.org/Problematic_extensions Problematic Extensions]
[https://support.mozilla.org/en-US/kb/Options%20window Options]
If the problem persists, please also check in a [https://support.mozilla.org/en-US/kb/Managing-profiles new profile]. If the new profile is okay, you can then [https://support.mozilla.org/en-US/kb/reset-firefox-easily-fix-most-problems Reset Firefox] on the old (previous) profile via '''Help''' ('''Alt''' + '''H''') > '''Troubleshooting Information'''.

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'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''

Why is HTML content missing on some websites with Firefox 13?

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