Just add the following line of code to your "header.php" file, located in your site's root directory. Be sure to add it before any CSS tags...
echo "<link rel=\"alternate\" href=\"/backend.php\" type=\"application/rss+xml\" title=\"YOUR Site Name\">\n";
That's it! Now your site's feed will work with Firefox's automatic bookmark feature. Visitors of your site who use Firefox will be glad you did this! And as a reminder, do not add this line of code after any CSS tags. I made that mistake at first and it didn't work. Once I realized it needed to be before them, it worked.
God Bless <><