You've got aids

@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document domain("www.messenger.com") {
h2, h3, h4, h5, h6 {
    color: #eee;
}
._5743, ._hh7, ._4rph ._4rpj {
    color: white !important;
}
label {
    color: #aaa;
}
._2y8y, ._2y8_, ._4jgt, input._58al {
    background-color: #2d2d30 !important;
    color: white !important;
}
input::-moz-placeholder {
    color: #ccc !important;
}
/*input::-webkit-input-placeholder {
    color: #888 !important;
}*/
._36ic, ._5742 {
    background-color: rgba(255, 255, 255, .05) !important;
}
._4sp8 {
    background-color: #1e1e1e;
    color: #eee;
}
._1q5- {
    border-left-color: rgba(255, 255, 255, .1) !important;
}
._17w2 {
    color: white !important;
}

._llq, ._36zg, ._1n-e._36zg {
    color: #eee !important;
}
._hh7 {
    background-color: #2d2d30 !important;
}
._hh7, ._hh7 a {
    color: #ddd !important;
}
._hh7:active, ._-5k ._hh7, ._hh7>span>a:hover {
    background-color: #333 !important;
}
._nd_ ._hh7 {
    background-color: #004488 !important;
}
._nd_ ._hh7:active, ._nd_._-5k ._hh7, ._nd_ ._hh7>span>a:hover {
    background-color: #003377 !important;
}
._5i_d {
    border-color: rgba(255, 255, 255, .1) !important;
}
.__6k, .__6l {
    color: #ddd !important;
}
._29_7 ._3czg ._2e-7 ._2e-1, ._29_7 ._3czg ._2e-7 ._2e-2 {
    background-color: #444 !important;
}
._454y ._1mi- {
    background-color: #2d2d30 !important;
}
._454y ._1mj0 {
    background-color: #666 !important;
}
._454y ._1mj1 {
    border-color: #666 !important;
}
._2f5n {
    background-color: #2d2d30 !important;
}
._2f5n ._29ey {
    color: #ccc !important;
}
._hw2 ._53ij {
    background-color: #040404 !important;
}
._4rv3 {
    background-color: #1e1e1e !important;
    border-top-color: rgba(255, 255, 255, .1) !important;
}
._2poz[style*="sticker"] {
    background-color: #333;
    border-radius: 5px;
}
._576q {
    -webkit-filter: brightness(75%);
    filter: brightness(75%);
}
._4sp8 .uiBoxYellow {
    background-color: #662;
}

._4_j5, ._5l37 {
    background-color: #282828 !important;
}
._4_j5 {
    border-left: none !important;
}
._2jnv, ._364g {
    color: #ddd !important;
}

._li ._1enh {
    background-color: #1e1e1e;
}
._1ht1 {
    background-color: #222 !important;
}
._1ht1._1ht3 {
    background-color: #1c2e4a !important;
    transition: background-color .5s;
}
._1ht1._1ht2 {
    background-color: #2d2d30 !important;
}
._1ht6, ._3q34 {
    color: #eee !important;
}
._2kt ._5nxb {
    color: #ddd !important;
}
._1ht7.timestamp {
    color: #999;
}
._1ht3 ._1ht7 {
    color: #0084cc !important;
}
._1ht3 ._1htf {
    color: #ddd !important;
}

._5t4c, ._225b {
    background-color: #1e1e1e !important;
}
._1u5d {
    background-color: transparent !important;
}
._2lp- {
    border-color: #0066aa !important;
}
._48uj {
    background-color: #0066aa !important;
}
._53ij, ._54nf, ._293j, ._55r1 {
    background-color: #333 !important;
}
._5r8a._5r8b {
    background-color: #222 !important;
}
._2i-c ._54nf ._54nh {
    color: #ddd !important;
}
._2i-c ._54ne ._54nh, ._2i-c ._54ne ._54nc, ._2i-c ._54ne {
    background-color: #0066aa !important;
}
._5r8e, ._5r86, ._37wu, ._37wv {
    border-color: #222;
}
._eb3::before {
    background-color: #222;
}
._3mts .uiScrollableArea.contentAfter::after,
._5r8l .uiScrollableArea.contentAfter::after {
    background-image: linear-gradient(transparent, #333);
}
._53ik ._53io, ._53il ._53io {
    -webkit-filter: brightness(20%);
    filter: brightness(20%);
}
._3i_m ._9ah ._57e_ {
    color: #1e1e1e !important;
}
._fl3:not(._20nb), ._4-0h, ._57gs, label > input + span::before {
    -webkit-filter: brightness(80%);
    filter: brightness(80%);
}
._5iwn ._58ak::before, ._23ct, .sp_iPuvEF8GUpL.sx_28245e,
.sp_SQs9w-791hG.sx_691f71,
:not(._3no3) > ._uwa, ._5jdr ._5jds,
.sp_SQs9w-791hG.sx_eb08e3 {
    -webkit-filter: invert(1);
    filter: invert(1);
}
._4-hz, ._4eby, ._4jgp ._4jgu {
    background-color: #222 !important;
}
._374c, ._4jgs, ._2c9i ._19jt, ._51l0 .uiInputLabel .__rm + .uiInputLabelLabel,
._5raa, ._5rab {
    color: #ddd !important;
}
._4-i0 {
    background-color: #333 !important;
    border-bottom-color: #2e2e2e;
}
._4-i0 ._52c9, ._5r5c ._5rq_, ._uvt {
    color: #ddd !important;
}
div._4-i2, div._5a8u, ._4t2a {
    background-color: #222 !important;
    color: #eee;
}
._t {
    background-color: #222 !important;
    color: #eee;
}
.fcb {
    color: white !important;
}
._c24 {
    color: #ccc !important;
}
.uiBoxGray {
    background-color: #333 !important;
    border-color: #2e2e2e;
}
#captcha .captcha_refresh {
    color: lightgrey !important;
}
._3v_p, ._3v_o {
    background-color: #222 !important;
}
._3v_p ._5hy4, ._3v_o ._5hy4 {
    color: #eee !important;
}
._3v_p ._43di, ._3v_o ._43di, ._3v_p ._3403, ._3v_o ._3403 {
    color: #ddd !important;
}
._3v_p ._210j ._43dj .uiInputLabelLabel, ._59h8, ._3v_p ._59h7 ._5hy9 {
    color: #aaa !important;
}
._3v_p ._3v_w ._2m_r, ._3v_p ._5s4n ._2m_r {
    background-color: #0066aa !important;
}
._17cj, ._17cj ._3jne {
    background-color: #1e1e1e !important;
}
._17cj ._3jnu, ._17cj ._3jnv {
    color: rgba(255, 255, 255, .4) !important;
}
._17cj ._4j_k {
    color: #eee !important;
}
._2her, ._9ah {
    color: rgb(119, 119, 119) !important;
}
._4t9y, ._4_j5 {
    /*display: none;*/
    max-width: 281px !important;
    min-width: 280px !important;
}
._ih3, ._3tl0, ._3tl1 ._10w4, ._497p, ._3x6v, ._2v6o, ._3tky, ._5rh4, ._jf4 ._jf3, ._5i_d .__6m, ._2y8z,
._4g0h, ._3xcx, ._225b, ._3q35, ._2r2v, ._2n1t, ._1n-e, ._3eus, ._2wy4, ._1u5d ._1u5k, ._3ggt,
._17cj ._2ze8, ._17cj ._cen {
    color: rgba(255, 255, 255, .6) !important;
}
}