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As of 6/16 the extension disappeared from feedly. Tampermonkey shows it's still active, but it seems to be completed disabled or something.
Same under GreaseMonkey. :-(
Because Feedly unfortunately did make some changes to the old rendering engine. It would only be necessary for Dexmaster to rewrite the CFS for the new rendering engine.
Although he promised me in December '16 to look at it, he probably did not have time, or he not use Feedly now.