Facebook rolled out its Reactions last month, and so far, the response has been less than enthusiastic. For those who find the little emoticons annoying or unsightly, you might tolerate them a bit more if you were able to pick your own images.
Reaction Packs is a new extension for Firefox and Chrome that lets you swap the preset emojis for something else. Right now, you can pick from a number of collections, including Pokémon, Soot Sprites, and Donald Trump. And if Pikachu or Trump are not your cup of tea, you can also make your own. However, you're the only one who will be able to see these modified reactions, so keep that in mind when clicking the angry Jigglypuff or pouting GOP candidate.