Pros: I've looked at all the other options for such addons that I could find and this is the only one that not only copies the emoji to the clipboard automatically, but also inserts it automatically into the text field. Also, the icons are large/clear and organized into categories with a recently used section, and you can type your whole message in the pop out window text field if need be (rather than it just being a place to copy the emoji), which is useful for Twitter (see below). There is a search function as well and other useful links that don't get in the way.

Cons: As someone with a dark setup/theme, the large white box of the addon isn't very nice to look at, but it's not a deal breaker since it's only open when you need it (having a dark theme option would be appreciated though ^^). Also, when it updates, the icon moves back to it's default position from where I put it, which is kind of annoying, but again, not a big deal.

Other: The icon for the addon is the same size as any other (I don't know what the previous reviewer is talking about). Also, on Twitter (only place I have seen this occur), if you use one emoji and then go back to use another, the previous emoji disappears and just leaves a black space - this means you have to add all the emojis you want to use at once and then c/p them to where you want them, which is pretty annoying. This appears to be an issue with all such addons though, so it's probably a problem with Twitter and not the addons.

All in all, a very useful and well put together addon. Thanks for all your hard work!