diff --git a/toolkit/locales/en-US/chrome/pluginproblem/pluginproblem.dtd b/toolkit/locales/en-US/chrome/pluginproblem/pluginproblem.dtd
index 1c2aa2a37b21..a9abfd087078 100644
--- a/toolkit/locales/en-US/chrome/pluginproblem/pluginproblem.dtd
+++ b/toolkit/locales/en-US/chrome/pluginproblem/pluginproblem.dtd
@@ -3,7 +3,6 @@
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 
 <!-- LOCALIZATION NOTE (tapToPlayPlugin): Mobile (used for touch interfaces) only has one type of plugin possible. -->
-<!ENTITY pluginActivationWarning                             "This site uses a plugin that may slow &brandShortName;.">
 <!ENTITY tapToPlayPlugin                                     "Tap here to activate plugin.">
 <!ENTITY clickToActivatePlugin                               "Activate plugin.">
 <!ENTITY checkForUpdates                                     "Check for updates…">
diff --git a/toolkit/pluginproblem/content/pluginProblem.xml b/toolkit/pluginproblem/content/pluginProblem.xml
index 5939d7b5465b..d890be9006a4 100644
--- a/toolkit/pluginproblem/content/pluginProblem.xml
+++ b/toolkit/pluginproblem/content/pluginProblem.xml
@@ -27,7 +27,6 @@
                 <html:label>
                     <html:button class="icon" anonid="icon"/>
                     <html:div class="msg msgVulnerabilityStatus" anonid="vulnerabilityStatus"><!-- set at runtime --></html:div>
-                    <html:div class="msg msgActivationWarning">&pluginActivationWarning;</html:div>
                     <html:div class="msg msgTapToPlay">&tapToPlayPlugin;</html:div>
                     <html:div class="msg msgClickToPlay" anonid="clickToPlay">&clickToActivatePlugin;</html:div>
                 </html:label>
diff --git a/toolkit/pluginproblem/content/pluginProblemContent.css b/toolkit/pluginproblem/content/pluginProblemContent.css
index 3fb095012f5e..89684166382b 100644
--- a/toolkit/pluginproblem/content/pluginProblemContent.css
+++ b/toolkit/pluginproblem/content/pluginProblemContent.css
@@ -97,7 +97,6 @@ a .hoverBox,
 
 a .msgClickToPlay,
 :-moz-handler-clicktoplay .msgClickToPlay,
-:-moz-handler-clicktoplay .msgActivationWarning,
 :-moz-handler-vulnerable-updatable .msgVulnerabilityStatus,
 :-moz-handler-vulnerable-updatable .msgCheckForUpdates,
 :-moz-handler-vulnerable-updatable .msgClickToPlay,