diff --git a/data/filters.svg b/data/filters.svg
deleted file mode 100644
index 6119d59..0000000
--- a/data/filters.svg
+++ /dev/null
@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<svg xmlns="http://www.w3.org/2000/svg">
-  <filter id="fill">
-    <feComposite in="FillPaint" in2="SourceGraphic" operator="in"/>
-  </filter>
-</svg>
diff --git a/data/usercontext.css b/data/usercontext.css
deleted file mode 100644
index 0f36d19..0000000
--- a/data/usercontext.css
+++ /dev/null
@@ -1,143 +0,0 @@
-#userContext-indicator {
-  height: 16px;
-  list-style-image: none !important;
-  vertical-align: middle;
-  width: 16px;
-}
-
-#userContext-label {
-  color: var(--identity-tab-color) !important;
-  margin-inline-end: 5px;
-  max-inline-size: 75px;
-  text-overflow: ellipsis;
-  white-space: nowrap;
-}
-
-#userContext-icons {
-  -moz-box-align: center;
-  align-items: center;
-  display: flex;
-  max-inline-size: 120px;
-}
-
-#userContext-icons[data-identity-color=""] {
-  display: none;
-}
-
-/* containers experiment */
-
-/* reset nightly containers */
-.tabbrowser-tab[usercontextid] {
-  background-image: none !important;
-  background-repeat: no-repeat;
-  background-size: 0;
-}
-
-/* special styles run through a psuedo-class off of
-these elements so they need to be relatively positioned.
-these styles address both regular and compact themes,
-special cases are addressed below */
-.tabbrowser-tab[usercontextid] .tab-background-middle,
-#main-window[style*='compact'] .tabbrowser-tab[usercontextid] .tab-content,
-#verticaltabs-box .tabbrowser-tab[usercontextid] .tab-content {
-  position: relative;
-}
-
-.tabbrowser-tab[usercontextid] .tab-background-middle::after,
-#main-window[style*='compact'] .tabbrowser-tab[usercontextid] .tab-content::after {
-  background-color: var(--identity-tab-color);
-  bottom: 0;
-  content: '';
-  height: 2px;
-  left: 0;
-  position: absolute;
-  right: 0;
-  width: 100%;
-  z-index: 999;
-}
-
-.tabbrowser-tab[usercontextid] .tab-background-middle::after {
-  background-color: var(--identity-tab-color);
-  border-radius: 2px 2px 0 0;
-  bottom: 1px;
-  height: 3px;
-}
-
-.tabbrowser-tab[usercontextid]:not([visuallyselected="true"]) .tab-background-middle::after {
-  bottom: 2px;
-  height: 2px !important;
-}
-
-.tabbrowser-tab[usercontextid][pinned="true"] .tab-background-middle::after {
-  left: -150%;
-  width: 400%;
-}
-
-.tabs-newtab-button .toolbarbutton-icon[type="menu"] {
-  margin-inline-end: 0;
-}
-
-.tabs-newtab-button .toolbarbutton-menu-dropmarker {
-  display: none;
-}
-
-#new-tab-overlay {
-  --icon-size: 16px;
-  -moz-appearance: none;
-  background: transparent;
-  font-style: -moz-use-system-font;
-  inline-size: 180px;
-  margin-inline-start: -50px !important;
-  visibility: visible;
-}
-
-#new-tab-overlay .panel-arrowcontent {
-  -moz-appearance: none !important;
-  background: none;
-  border: 0;
-  box-shadow: none;
-  display: block;
-  margin-block-end: 0;
-  margin-block-start: 2px;
-  padding-block-start: 0 !important;
-}
-
-#new-tab-overlay .panel-arrowcontent,
-#new-tab-overlay menuitem {
-  inline-size: 100%;
-}
-
-#new-tab-overlay .panel-arrowbox {
-  display: none;
-}
-
-#new-tab-overlay[hidden=true] {
-  display: none;
-}
-
-#new-tab-overlay menuitem {
-  -moz-appearance: none;
-  background: white;
-  border-radius: 20px;
-  border: 0;
-  box-shadow: 0 0 7px #0004;
-  color: #4b4b4b;
-  margin-block-end: 5px;
-  padding-block-end: 10px;
-  padding-block-start: 10px;
-  padding-inline-end: 10px;
-  padding-inline-start: 10px;
-}
-
-#new-tab-overlay menuitem:hover {
-  background: #f2f2f2;
-}
-
-#new-tab-overlay .menuitem-iconic[data-usercontextid] > .menu-iconic-left > .menu-iconic-icon {
-  block-size: var(--icon-size);
-  inline-size: var(--icon-size);
-}
-
-.menuitem-iconic[data-usercontextid] > .menu-iconic-left {
-  visibility: visible;
-}
diff --git a/data/usercontext.svg b/data/usercontext.svg
deleted file mode 100644
index f58067a..0000000
--- a/data/usercontext.svg
+++ /dev/null
@@ -1,72 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="32" height="32" viewBox="0 0 32 32" style="enable-background:new 0 0 32 32;">
-  <style>
-    path, circle, g {
-      fill: menutext;
-    }
-    path:not(:target),
-    circle:not(:target),
-    g:not(:target) {
-      display: none;
-    }
-  </style>
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