HubSpot users currently have two formatting options for their blog RSS feeds. Feeds can display either a summary (first paragraph) style post format or a full post format depending on the configured options. To adjust your RSS feed display navigate to Content > Content Settings > Blog > Subscriptions, and locate the check box labeled "Display summaries instead of full posts in RSS feeds". Toggle this option on or off to suit your preferences and then save your changes by clicking the Save button below to publish the changes.
Note: at this time Firefox does not support full-post style RSS feeds, but most feed readers and modern browsers will.