Click on the Updates tab on that page, this will take you to the Bodhi (Fedora’s update system) which will show you all the updates for that package. On this page, click on the search field shown in the image below to open the drop down menu to apply filters. For the Releases filter, select the desired Fedora release and click Apply Filters. On the resulting page, right click to see the source of the page and search for rss in it. You will find a link like https://bodhi.fedoraproject.org/rss/updates/?search=&packages=firefox&releases=F38 in there.
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