diff --git a/toolkit/themes/linux/mozapps/extensions/experimentGeneric.png b/toolkit/themes/linux/mozapps/extensions/experimentGeneric.png
deleted file mode 100644
index a9d00545ef..0000000000
Binary files a/toolkit/themes/linux/mozapps/extensions/experimentGeneric.png and /dev/null differ
diff --git a/toolkit/themes/linux/mozapps/extensions/extensions.css b/toolkit/themes/linux/mozapps/extensions/extensions.css
index 5c642fbbf1..577c65e654 100644
--- a/toolkit/themes/linux/mozapps/extensions/extensions.css
+++ b/toolkit/themes/linux/mozapps/extensions/extensions.css
@@ -226,9 +226,6 @@
 #category-dictionary > .category-icon {
   list-style-image: url("chrome://mozapps/skin/extensions/category-dictionaries.png");
 }
-#category-experiment > .category-icon {
-  list-style-image: url("chrome://mozapps/skin/extensions/category-experiments.png");
-}
 #category-availableUpdates > .category-icon {
   list-style-image: url("chrome://mozapps/skin/extensions/category-available.png");
 }
@@ -420,10 +417,6 @@
   list-style-image: url("chrome://mozapps/skin/extensions/dictionaryGeneric.png");
 }
 
-.addon-view[type="experiment"] .icon {
-  list-style-image: url("chrome://mozapps/skin/extensions/experimentGeneric.png");
-}
-
 .name-container {
   font-size: 150%;
   margin-bottom: 0;
@@ -927,30 +920,3 @@ setting[type="radio"] > radiogroup {
 .header-button .toolbarbutton-text {
   display: none;
 }
-
-/*** telemetry experiments ***/
-
-#detail-experiment-container {
-  font-size: 80%;
-  margin-bottom: 1em;
-}
-
-#detail-experiment-bullet-container,
-#detail-experiment-state,
-#detail-experiment-time,
-.experiment-bullet-container,
-.experiment-state,
-.experiment-time {
-  vertical-align: middle;
-  display: inline-block;
-}
-
-.addon .experiment-bullet,
-#detail-experiment-bullet {
-  fill: rgb(158, 158, 158);
-}
-
-.addon[active="true"] .experiment-bullet,
-#detail-view[active="true"] #detail-experiment-bullet {
-  fill: rgb(106, 201, 20);
-}
diff --git a/toolkit/themes/linux/mozapps/jar.mn b/toolkit/themes/linux/mozapps/jar.mn
index 37325c0bec..0f459119c5 100644
--- a/toolkit/themes/linux/mozapps/jar.mn
+++ b/toolkit/themes/linux/mozapps/jar.mn
@@ -32,14 +32,12 @@ toolkit.jar:
   skin/classic/mozapps/extensions/category-plugins.png     (extensions/category-plugins.png)
   skin/classic/mozapps/extensions/category-service.png     (extensions/category-service.png)
   skin/classic/mozapps/extensions/category-dictionaries.png (extensions/category-dictionaries.png)
-  skin/classic/mozapps/extensions/category-experiments.png (extensions/category-experiments.png)
   skin/classic/mozapps/extensions/category-recent.png      (extensions/category-recent.png)
   skin/classic/mozapps/extensions/category-available.png   (extensions/category-available.png)
   skin/classic/mozapps/extensions/extensionGeneric.png     (extensions/extensionGeneric.png)
   skin/classic/mozapps/extensions/extensionGeneric-16.png  (extensions/extensionGeneric-16.png)
   skin/classic/mozapps/extensions/dictionaryGeneric.png    (extensions/dictionaryGeneric.png)
   skin/classic/mozapps/extensions/dictionaryGeneric-16.png (extensions/dictionaryGeneric-16.png)
-  skin/classic/mozapps/extensions/experimentGeneric.png    (extensions/experimentGeneric.png)
   skin/classic/mozapps/extensions/themeGeneric.png         (extensions/themeGeneric.png)
   skin/classic/mozapps/extensions/themeGeneric-16.png      (extensions/themeGeneric-16.png)
   skin/classic/mozapps/extensions/localeGeneric.png        (extensions/localeGeneric.png)
diff --git a/toolkit/themes/osx/mozapps/extensions/experimentGeneric.png b/toolkit/themes/osx/mozapps/extensions/experimentGeneric.png
deleted file mode 100644
index a9d00545ef..0000000000
Binary files a/toolkit/themes/osx/mozapps/extensions/experimentGeneric.png and /dev/null differ
diff --git a/toolkit/themes/osx/mozapps/extensions/extensions.css b/toolkit/themes/osx/mozapps/extensions/extensions.css
index 474cb12d10..80ca44c191 100644
--- a/toolkit/themes/osx/mozapps/extensions/extensions.css
+++ b/toolkit/themes/osx/mozapps/extensions/extensions.css
@@ -258,9 +258,6 @@
 #category-dictionary > .category-icon {
   list-style-image: url("chrome://mozapps/skin/extensions/category-dictionaries.png");
 }
-#category-experiment > .category-icon {
-  list-style-image: url("chrome://mozapps/skin/extensions/category-experiments.png");
-}
 #category-availableUpdates > .category-icon {
   list-style-image: url("chrome://mozapps/skin/extensions/category-available.png");
 }
@@ -485,10 +482,6 @@
   list-style-image: url("chrome://mozapps/skin/extensions/dictionaryGeneric.png");
 }
 
-.addon-view[type="experiment"] .icon {
-  list-style-image: url("chrome://mozapps/skin/extensions/experimentGeneric.png");
-}
-
 .name-container {
   font-size: 150%;
   margin-bottom: 0;
@@ -1177,30 +1170,3 @@ button.button-link:not([disabled="true"]):active:hover {
   box-shadow: inset 0 0 4px rgb(45,54,71), 0 1px rgba(255,255,255,0.25);
   background-image: linear-gradient(rgba(45,54,71,0.6), transparent);
 }
-
-/*** telemetry experiments ***/
-
-#detail-experiment-container {
-  font-size: 80%;
-  margin-bottom: 1em;
-}
-
-#detail-experiment-bullet-container,
-#detail-experiment-state,
-#detail-experiment-time,
-.experiment-bullet-container,
-.experiment-state,
-.experiment-time {
-  vertical-align: middle;
-  display: inline-block;
-}
-
-.addon .experiment-bullet,
-#detail-experiment-bullet {
-  fill: rgb(158, 158, 158);
-}
-
-.addon[active="true"] .experiment-bullet,
-#detail-view[active="true"] #detail-experiment-bullet {
-  fill: rgb(106, 201, 20);
-}
diff --git a/toolkit/themes/osx/mozapps/jar.mn b/toolkit/themes/osx/mozapps/jar.mn
index eabd2eddb5..c0c66225f3 100644
--- a/toolkit/themes/osx/mozapps/jar.mn
+++ b/toolkit/themes/osx/mozapps/jar.mn
@@ -17,7 +17,6 @@ toolkit.jar:
   skin/classic/mozapps/extensions/category-plugins.png            (extensions/category-plugins.png)
   skin/classic/mozapps/extensions/category-service.png            (extensions/category-service.png)
   skin/classic/mozapps/extensions/category-dictionaries.png       (extensions/category-dictionaries.png)
-  skin/classic/mozapps/extensions/category-experiments.png        (extensions/category-experiments.png)
   skin/classic/mozapps/extensions/category-recent.png             (extensions/category-recent.png)
   skin/classic/mozapps/extensions/category-available.png          (extensions/category-available.png)
   skin/classic/mozapps/extensions/discover-logo.png               (extensions/discover-logo.png)
@@ -27,7 +26,6 @@ toolkit.jar:
   skin/classic/mozapps/extensions/themeGeneric-16.png             (extensions/themeGeneric-16.png)
   skin/classic/mozapps/extensions/dictionaryGeneric.png           (extensions/dictionaryGeneric.png)
   skin/classic/mozapps/extensions/dictionaryGeneric-16.png        (extensions/dictionaryGeneric-16.png)
-  skin/classic/mozapps/extensions/experimentGeneric.png           (extensions/experimentGeneric.png)
   skin/classic/mozapps/extensions/localeGeneric.png               (extensions/localeGeneric.png)
   skin/classic/mozapps/extensions/rating-won.png                  (extensions/rating-won.png)
   skin/classic/mozapps/extensions/rating-not-won.png              (extensions/rating-not-won.png)
diff --git a/toolkit/themes/windows/mozapps/extensions/experimentGeneric.png b/toolkit/themes/windows/mozapps/extensions/experimentGeneric.png
deleted file mode 100644
index a9d00545ef..0000000000
Binary files a/toolkit/themes/windows/mozapps/extensions/experimentGeneric.png and /dev/null differ
diff --git a/toolkit/themes/windows/mozapps/extensions/extensions.css b/toolkit/themes/windows/mozapps/extensions/extensions.css
index f350f7ca64..51d95af86b 100644
--- a/toolkit/themes/windows/mozapps/extensions/extensions.css
+++ b/toolkit/themes/windows/mozapps/extensions/extensions.css
@@ -276,9 +276,6 @@
 #category-dictionary > .category-icon {
   list-style-image: url("chrome://mozapps/skin/extensions/category-dictionaries.png");
 }
-#category-experiment > .category-icon {
-  list-style-image: url("chrome://mozapps/skin/extensions/category-experiments.png");
-}
 #category-availableUpdates > .category-icon {
   list-style-image: url("chrome://mozapps/skin/extensions/category-available.png");
 }
@@ -499,10 +496,6 @@
   list-style-image: url("chrome://mozapps/skin/extensions/dictionaryGeneric.png");
 }
 
-.addon-view[type="experiment"] .icon {
-  list-style-image: url("chrome://mozapps/skin/extensions/experimentGeneric.png");
-}
-
 .name-container {
   font-size: 150%;
   font-weight: bold;
@@ -1205,30 +1198,3 @@ button.button-link:not([disabled="true"]):active:hover {
 .header-button > .toolbarbutton-text {
   display: none;
 }
-
-/*** telemetry experiments ***/
-
-#detail-experiment-container {
-  font-size: 80%;
-  margin-bottom: 1em;
-}
-
-#detail-experiment-bullet-container,
-#detail-experiment-state,
-#detail-experiment-time,
-.experiment-bullet-container,
-.experiment-state,
-.experiment-time {
-  vertical-align: middle;
-  display: inline-block;
-}
-
-.addon .experiment-bullet,
-#detail-experiment-bullet {
-  fill: rgb(158, 158, 158);
-}
-
-.addon[active="true"] .experiment-bullet,
-#detail-view[active="true"] #detail-experiment-bullet {
-  fill: rgb(106, 201, 20);
-}
diff --git a/toolkit/themes/windows/mozapps/jar.mn b/toolkit/themes/windows/mozapps/jar.mn
index 53c69eb5b0..ae3e4a0a74 100644
--- a/toolkit/themes/windows/mozapps/jar.mn
+++ b/toolkit/themes/windows/mozapps/jar.mn
@@ -55,7 +55,6 @@ toolkit.jar:
   skin/classic/mozapps/extensions/themeGeneric-16.png        (extensions/themeGeneric-16.png)
   skin/classic/mozapps/extensions/dictionaryGeneric.png      (extensions/dictionaryGeneric.png)
   skin/classic/mozapps/extensions/dictionaryGeneric-16.png   (extensions/dictionaryGeneric-16.png)
-  skin/classic/mozapps/extensions/experimentGeneric.png      (extensions/experimentGeneric.png)
   skin/classic/mozapps/extensions/localeGeneric.png          (extensions/localeGeneric.png)
   skin/classic/mozapps/extensions/rating-won.png             (extensions/rating-won.png)
   skin/classic/mozapps/extensions/rating-not-won.png         (extensions/rating-not-won.png)