The best alternatives to Tabby Cat are Giphy Tab, Orbit, the cat, and Flickr. If these 3 options don't work for you, we've listed a few more alternatives below.
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I made this extenstion because I miss my cat at work. Added a ton of jokes (murphies laws, cat jokes and what not!). If you're a cat lover, you'll love this chrome extension. (PS: I've been trying to practice mindfulness at work, so this extension hasa nice little surprise that'll help you be more mindful at work)