--- a/dom/chrome/dom/dom.properties
+++ b/dom/chrome/dom/dom.properties
@@ -319,16 +319,27 @@ ModuleSourceLoadFailed=Loading failed for the module with source “%S”.
 # LOCALIZATION NOTE: Do not translate "<script>".
 ScriptSourceMalformed=<script> source URI is malformed: “%S”.
 ModuleSourceMalformed=Module source URI is malformed: “%S”.
 # LOCALIZATION NOTE: Do not translate "<script>".
 ScriptSourceNotAllowed=<script> source URI is not allowed in this document: “%S”.
 ModuleSourceNotAllowed=Module source URI is not allowed in this document: “%S”.
 WebExtContentScriptModuleSourceNotAllowed=WebExtension content scripts may only load modules with moz-extension URLs and not: “%S”.
 ModuleResolveFailure=Error resolving module specifier “%S”. Relative module specifiers must start with “./”, “../” or “/”.
+ImportMapInvalidTopLevelKey=An invalid top-level key “%S” was present in the import map.
+ImportMapEmptySpecifierKeys=Specifier keys cannot be empty strings.
+ImportMapAddressesNotStrings=Addresses need to be strings.
+ImportMapInvalidAddress=Address “%S” was invalid.
+# %1$S is the specifier key, %2$S is the URL.
+ImportMapAddressNotEndsWithSlash=An invalid address was given for the specifier key “%1$S”; since “%1$S” ended in a slash, the address “%2$S” needs to as well.
+ImportMapScopePrefixNotParseable=The scope prefix URL “%S” was not parseable.
+ImportMapResolutionBlockedByNullEntry=Resolution of specifier “%S” was blocked by a null entry.
+ImportMapResolutionBlockedByAfterPrefix=Resolution of specifier “%S” was blocked since the substring after prefix could not be parsed as a URL relative to the address in the import map.
+ImportMapResolutionBlockedByBacktrackingPrefix=Resolution of specifier “%S” was blocked since the parsed URL does not start with the address in the import map.
+ImportMapResolveInvalidBareSpecifier=The specifier “%S” was a bare specifier, but was not remapped to anything.
 # LOCALIZATION NOTE: %1$S is the invalid property value and %2$S is the property name.
 InvalidKeyframePropertyValue=Keyframe property value “%1$S” is invalid according to the syntax for “%2$S”.
 # LOCALIZATION NOTE: Do not translate "ReadableStream".
 ReadableStreamReadingFailed=Failed to read data from the ReadableStream: “%S”.
 # LOCALIZATION NOTE: Do not translate "registerProtocolHandler"
 RegisterProtocolHandlerPrivateBrowsingWarning=Can’t use registerProtocolHandler inside private browsing mode.
 MotionEventWarning=Use of the motion sensor is deprecated.
 OrientationEventWarning=Use of the orientation sensor is deprecated.