A userstyle that restores the old Twitter logo.

styles.css

h1[role="heading"] [aria-label="Twitter"] svg {
  display: none !important;
}

h1[role="heading"] [aria-label="Twitter"]:after {
  color: rgb(29, 155, 240);
  content: "[CHIRPBIRDICON]";
  font-family: "TwitterChirp";
  font-size: 28px;
  left: 9px;
  position: absolute;
  top: 9px;
}

/* TODO: Find a better way to select by theme */
body:not([style="background-color: #FFFFFF;"]):not([style="background-color: rgb(255, 255, 255);"]) h1[role="heading"] [aria-label="Twitter"]:after {
  color: rgb(255, 255, 255);
}