diff --git a/browser/locales/en-US/chrome/overrides/appstrings.properties b/browser/locales/en-US/chrome/overrides/appstrings.properties
index 877af4635cc..adecd7657b6 100644
--- a/browser/locales/en-US/chrome/overrides/appstrings.properties
+++ b/browser/locales/en-US/chrome/overrides/appstrings.properties
@@ -52,7 +52,7 @@ isprinting=The document cannot change while Printing or in Print Preview.
 deniedPortAccess=This address uses a network port which is normally used for purposes other than Web browsing. Firefox has canceled the request for your protection.
 proxyResolveFailure=Firefox is configured to use a proxy server that can't be found.
 proxyConnectFailure=Firefox is configured to use a proxy server that is refusing connections.
-contentEncodingError=The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression. Please contact the website owners to inform them of this problem.
+contentEncodingError=The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression.
 unsafeContentType=The page you are trying to view cannot be shown because it is contained in a file type that may not be safe to open. Please contact the website owners to inform them of this problem.
 externalProtocolTitle=External Protocol Request
 externalProtocolPrompt=An external application must be launched to handle %1$S: links.\n\n\nRequested link:\n\n%2$S\n\nApplication: %3$S\n\n\nIf you were not expecting this request it may be an attempt to exploit a weakness in that other program. Cancel this request unless you are sure it is not malicious.\n
diff --git a/dom/locales/en-US/chrome/appstrings.properties b/dom/locales/en-US/chrome/appstrings.properties
index 9dffdc69246..9987a568910 100644
--- a/dom/locales/en-US/chrome/appstrings.properties
+++ b/dom/locales/en-US/chrome/appstrings.properties
@@ -51,7 +51,7 @@ isprinting=The document cannot change while Printing or in Print Preview.
 deniedPortAccess=Access to the port number given has been disabled for security reasons.
 proxyResolveFailure=The proxy server you have configured could not be found. Please check your proxy settings and try again.
 proxyConnectFailure=The connection was refused when attempting to contact the proxy server you have configured. Please check your proxy settings and try again.
-contentEncodingError=The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression. Please contact the website owners to inform them of this problem.
+contentEncodingError=The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression.
 unsafeContentType=The page you are trying to view cannot be shown because it is contained in a file type that may not be safe to open. Please contact the website owners to inform them of this problem.
 externalProtocolTitle=External Protocol Request
 externalProtocolPrompt=An external application must be launched to handle %1$S: links.\n\n\nRequested link:\n\n%2$S\n\nApplication: %3$S\n\n\nIf you were not expecting this request it may be an attempt to exploit a weakness in that other program. Cancel this request unless you are sure it is not malicious.\n