What comments are you talking about? Got a screen shot?

Is it a news or blog site? A lot of news sites and blogs use a cross-site comment provider. Because the comment section is embedded on various sites you might visit, it's possible for the comment provider to track your browsing around the web. For that reason, some comment providers have been added to the tracking server list blocked by the Tracking Protection feature. To test whether that is the issue:

Click the shield icon toward the left end of the address bar (next to the lock icon). On the panel that drops down, click the blue slider switch to disable protection. Firefox should reload the page, or you can use Ctrl+R.

Any improvement?