Do you know whether Yahoo uses Disqus for its comments? Firefox's Enhanced Tracking Protection list was updated and now blocks Disqus comments. You can check the following thread for a workaround:

https://support.mozilla.org/questions/1440102

Note that you can use a wildcard.

Create a new String pref on the about:config page.

• about:config => urlclassifier.trackingSkipURLs => *.disqus.com,disqus.com
• https://support.mozilla.org/en-US/kb/about-config-editor-firefox

You need to close and restart Firefox to apply changes.

For anyone using this approach, you may now need to add this to your list as well:

c.disquscdn.com