No issue - Stop pre-processing some files that don't have preprocessor statements in them.

toolkit/components/formautofill/moz.build

@@ -8,12 +8,11 @@ XPIDL_SOURCES += ['nsIFormAutofillContentService.idl']
 XPIDL_MODULE = 'toolkit_formautofill'
 
 EXTRA_COMPONENTS += [
+    'formautofill.manifest',
     'FormAutofillContentService.js',
     'FormAutofillStartup.js',
 ]
 
-EXTRA_PP_COMPONENTS += ['formautofill.manifest']
-
 EXTRA_JS_MODULES += [
     'content/RequestAutocompleteUI.jsm',
     'FormAutofill.jsm',

toolkit/content/jar.mn

@@ -13,9 +13,9 @@ toolkit.jar:
    content/global/aboutAbout.js
    content/global/aboutAbout.xhtml
 #ifdef MOZ_OFFICIAL_BRANDING
-*  content/global/aboutRights.xhtml
+   content/global/aboutRights.xhtml
 #else
-*  content/global/aboutRights.xhtml           (aboutRights-unbranded.xhtml)
+   content/global/aboutRights.xhtml           (aboutRights-unbranded.xhtml)
 #endif
    content/global/aboutNetworking.js
    content/global/aboutNetworking.xhtml

toolkit/modules/moz.build

@@ -10,6 +10,7 @@ EXTRA_JS_MODULES += [
     'addons/WebNavigation.jsm',
     'addons/WebNavigationContent.js',
     'addons/WebNavigationFrames.jsm',
+    'addons/WebRequest.jsm',
     'addons/WebRequestCommon.jsm',
     'addons/WebRequestContent.js',
     'addons/WebRequestUpload.jsm',
@@ -84,7 +85,6 @@ EXTRA_JS_MODULES.third_party.jsesc += ['third_party/jsesc/jsesc.js']
 EXTRA_JS_MODULES.sessionstore += ['sessionstore/Utils.jsm']
 
 EXTRA_PP_JS_MODULES += [
-    'addons/WebRequest.jsm',
     'ResetProfile.jsm',
     'Troubleshoot.jsm',
     'UpdateUtils.jsm',