.feed {
    .expander {
        padding-right: 9px;
        font-size: 1.2rem;
    }

    .favorite {
        font-size: 1.8rem;
        float: right;
    }

    .header > div, .request-details > div {
        padding-top: 8px;
        padding-bottom: 8px;
        @extend .truncate;
    }

    .header {
        color: $toolbar;

        .expander {
            color: $table-header-icon-disabled;
            cursor: pointer;
        }

        .expander.expanded {
            color: $table-header-icon;
            @include rotate(90deg);
            padding: 4px 3px 1px 6px;
        }

        .expander {
            &:hover {
                color: $table-header;
            }

            &:not(.expanded), &:not(.expanded):hover {
                color: $table-header-icon-disabled;
                cursor: default;
                @include rotate(0deg);
            }
        }

        div {
            background-color: $table-header-bg;
            color: $table-header;
        }

        .favorite {
            color: $table-header-icon-disabled;

            &.active {
                cursor: pointer;
                color: $favorite;
            }

            &.enabled {
                cursor: pointer;
                color: $table-header-icon;

                &:hover {
                    color: $favorite;
                }
            }
        }
    }
}

.feed {
    .expander {
        padding-right: 9px;
        font-size: 1.2rem;
    }

    .favorite {
        font-size: 1.8rem;
        float: right;
    }

    .header > div, .request-details > div {
        padding-top: 8px;
        padding-bottom: 8px;
        @extend .truncate;
    }

    .header {
        color: $toolbar;

        .expander {
            color: $table-header-icon-disabled;
            cursor: pointer;
        }

        .expander.expanded {
            color: $table-header-icon;
            @include rotate(90deg);
            padding: 4px 3px 1px 6px;
        }

        .expander {
            &:hover {
                color: $table-header;
            }

            &:not(.expanded), &:not(.expanded):hover {
                color: $table-header-icon-disabled;
                cursor: default;
                @include rotate(0deg);
            }
        }

        div {
            background-color: $table-header-bg;
            color: $table-header;
        }

        .favorite {
            color: $table-header-icon-disabled;

            &.active {
                cursor: pointer;
                color: $favorite;
            }

            &.enabled {
                cursor: pointer;
                color: $table-header-icon;

                &:hover {
                    color: $table-header;
                }
            }
        }
    }
}

Change favorite header icon hover color to white.
Change favorite header icon hover color to white.