A simple version of Favmoji.css that just replaces the heart animation with an emoji.

SimpleFavmoji.css

/* Install the Stylish extension for your browser, then add this code
as a new Style. Make sure it applies to the domain 'twitter.com' */

/* You can get Stylish here: */
/* Safari - http://sobolev.us/stylish/ */
/* Chrome - https://chrome.google.com/webstore/detail/stylish/fjnbnpbmkenffdnngjfgmeleoegfcffe */

/* Tweet improvements, comments, or corrections to @mcnees. */

/* Thanks to: @pbausch, @mathowie, @blakestacey, @ukuleledan and others! */

/* Hide the heart for un-Faved tweets. */
.ProfileTweet-actionButton .HeartAnimationContainer {
  visibility: hidden;
}

.WebToast .HeartAnimationContainer {
  visibility: hidden;
}

/* Specify an emoji to use in place of the heart, for un-Faved tweets. */
.ProfileTweet-actionButton .HeartAnimationContainer:after {
  /* Use a grayed-out emoji for the unclicked Fav button. */
  content:'🍺';
  /* Safari or Chrome */
  -webkit-filter: grayscale(100%);
  opacity: 0.7;
  /* Firefox or Mozilla */
  /* -moz-filter: grayscale(100%); */
  visibility: visible;
  display: block;
  position: absolute;
}

/* Show the regular emoji when hovering over the fav button. */
.ProfileTweet-actionButton .HeartAnimationContainer:hover:after {
  /* Use a regular emoji for the hovered Fav button. */
  content:'🍺';
  /* Safari or Chrome */
  -webkit-filter: grayscale(0%);
  /* Firefox or Mozilla */
  /* -moz-filter: grayscale(50%); */
  visibility: visible;
  display: block;
  position: absolute;
}

/* Hide the heart for Faved tweets. */
.ProfileTweet-actionButtonUndo .HeartAnimationContainer {
  visibility: hidden;
}

/* Replace the heart for Faved tweets with an emoji. */
.ProfileTweet-actionButtonUndo .HeartAnimationContainer:after {
  /* Use a regular emoji for the clicked Fav button. */
  content:'🍺';
  visibility: visible;
  display: block;
  position: absolute;
}

/* Change the text color for the Fav count. */
.ProfileTweet-actionCountForPresentation {
 color: #999;
}