in Thunderbird RSS feeds, to block the top of every Craigslist ad .... Rated 5 out of 5 stars

Is there a way , in Thunderbird RSS feeds, to block the top of every Craigslist ad that comes to me. I must scroll down EVERY feed I read (which is hundreds). I would love to block that useless spam warning ,and other links enabling only the ad.
It says Adblock Plus works with Thunderbird however no signs that it installed.

This review is for a previous version of the add-on (0.7.5.1).