Geänderter Dropmarker (Quelle: Bird himself, einzige Änderung sind die data-URIs ohne Zeilenumbruch; bitte beim Kopieren darauf achten, dass das auch so bleibt!) - einzutragen in userchrome.css oder Stylish:
CSS
#back-forward-dropmarker > .toolbarbutton-menu-dropmarker {
padding: 0 1px 0 2px !important;
margin: 0;
list-style-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAYAAABWdVznAAAACXBIWXMAAA7DAAAOwwHHb6hkAAABmElEQVR4nF1STUtCQRS9d3wFfWggWbsgaBFC9EEEQigGQREUCAq6yWetgn5CVIvW7Vo9LAJfUG6KoCDIDwQhCCooaBUEwaNooWht3pvbzDPj5cDAnTPnzpw5ZxBahqoXZpBgSNYc+Wtd+bg6icWs5j42i2QmN4bIDkVpCfTGBglGRO0DwtX9RLDw17CSKU5xpAtCWD+Ih3TnjUk9P4uAGUGNyiaMHh+7us3+B0Dc3I8Hs60SG025OUC2V3f1DjO36QsIrCLJoxva9vhGOtQkylpiB4nwpXiX4bE+ZxUOOMUAy7+cAQ78dGJLmyRg7dzip0CUbWjHMhH4FefVnTXP2pe76rcsuBAeSdZzZ61n3clhCOyWgKQsKO/GvsFqiwh7OuQ0mWvJxmzDKIAIT6ymGCWx9KaOCoty435n+U0EEOGgzD9uqYbt4lFxQdpbdRmXtq0pPR8gwHNxgpqOh86cEuRBQruGwCPpRLj0F1xKz02LJk3Mimi8s2UQiDDBi8RVSf6XtBwyky6zb4YRDja+Br3Ulfdr59f4AQA9n32lCt+lAAAAAElFTkSuQmCC") !important;
}
#back-forward-dropmarker[open="true"] > .toolbarbutton-menu-dropmarker {
list-style-image: url("data:image/png;base64,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") !important;
}
#back-forward-dropmarker > .toolbarbutton-menu-dropmarker[disabled="true"]{
list-style-image: url("data:image/png;base64,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") !important;
}
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