Cannot see comments at many blogs, eg. Instapundit, Breitbart, etc

Disqus comments are blocked by Strict Tracking Protection. Your options are to: 1. [[Enhanced Tracking Protection in Firefox for desktop#w_standard-enhanced-tracking-protection|Downgrade Tracking Protection to Standard]]. 2. [[Enhanced Tracking Protection in Firefox for desktop#w_what-to-do-if-a-site-seems-broken|Disable Tracking Protection for the site]]. 3. Create '''urlclassifier.trackingSkipURLs''' (String) with value '''<WEBSITE>.disqus.com, disqus.com''' in [https://support.mozilla.org/en-US/kb/about-config-editor-firefox about:config]. You can find the <WEBSITE> value by looking in the Network Monitor (Ctrl+Shift+E).