Yay, the red cats are back! Rated 5 out of 5 stars
Red Cats Green Flavor has always been my favorite Firefox theme (& I love its Blue Flavor cousin too)! My lazy tuxedo & lazy tabby cats love it too.
Now works with Firefox 24, & looks like it's good to go for the next couple of upgrades too — "Full compatibility with Firefox 27.0a1." I realized I'd been using this great theme for years without ever fully showing my thanks, so I just thanks to the developer Red_Fat_Lazy_Cat by sending a Paypal donation. Thanks Red Cat!