diff --git a/calendar/libical/src/libical/autogenex/ical.h b/calendar/libical/src/libical/autogenex/ical.h
index b740a630961..b955ddfe91f 100644
--- a/calendar/libical/src/libical/autogenex/ical.h
+++ b/calendar/libical/src/libical/autogenex/ical.h
@@ -851,7 +851,7 @@ enum {
 
 /********************** Recurrence type routines **************/
 
-/* See RFC 2445 Section 4.3.10, RECUR Value, for an explaination of
+/* See RFC 2445 Section 4.3.10, RECUR Value, for an explanation of
    the values and fields in struct icalrecurrencetype */
 
 #define ICAL_BY_SECOND_SIZE 61
diff --git a/calendar/libical/src/libical/icalrecur.h b/calendar/libical/src/libical/icalrecur.h
index 45bdd21b65a..e97bea53dcb 100644
--- a/calendar/libical/src/libical/icalrecur.h
+++ b/calendar/libical/src/libical/icalrecur.h
@@ -114,7 +114,7 @@ enum {
  * Recurrence type routines
  */
 
-/* See RFC 2445 Section 4.3.10, RECUR Value, for an explaination of
+/* See RFC 2445 Section 4.3.10, RECUR Value, for an explanation of
    the values and fields in struct icalrecurrencetype */
 
 #define ICAL_BY_SECOND_SIZE 61
diff --git a/intl/uconv/util/ugen.c b/intl/uconv/util/ugen.c
index 8b4cee8cac2..b327be6abf5 100644
--- a/intl/uconv/util/ugen.c
+++ b/intl/uconv/util/ugen.c
@@ -625,7 +625,7 @@ PRIVATE PRBool uCheckAndGenJohabHangul(
     {
     /*
     See Table 4-45 (page 183) of CJKV Information Processing
-    for detail explaination of the following table
+    for detail explanation of the following table.
         */
         /*
         static const PRUint8 lMap[LCount] = {
diff --git a/java/webclient/src_moz/motif/BrowserControlNativeShimStub.cpp b/java/webclient/src_moz/motif/BrowserControlNativeShimStub.cpp
index 2c83ff810c2..e4a8dcbe281 100644
--- a/java/webclient/src_moz/motif/BrowserControlNativeShimStub.cpp
+++ b/java/webclient/src_moz/motif/BrowserControlNativeShimStub.cpp
@@ -24,7 +24,7 @@
  * BrowserControlNativeShimStub.cpp
  */
 
-// PENDING(mark): I suppose this is where I need to go into my explaination of why
+// PENDING(mark): I suppose this is where I need to go into my explanation of why
 // this file is needed...
 
 // For loading DLL
diff --git a/java/webclient/src_moz/motif/MotifBrowserControlCanvasStub.cpp b/java/webclient/src_moz/motif/MotifBrowserControlCanvasStub.cpp
index 4f45eace65f..6c22e821d88 100644
--- a/java/webclient/src_moz/motif/MotifBrowserControlCanvasStub.cpp
+++ b/java/webclient/src_moz/motif/MotifBrowserControlCanvasStub.cpp
@@ -25,7 +25,7 @@
  * MotifBrowserControlCanvasStub.cpp
  */
 
-// PENDING(mark): I suppose this is where I need to go into my explaination of why
+// PENDING(mark): I suppose this is where I need to go into my explanation of why
 // this file is needed...
 
 #include <jni.h>
diff --git a/java/webclient/src_moz/motif/NativeLoaderStub.cpp b/java/webclient/src_moz/motif/NativeLoaderStub.cpp
index 9ab10e1d643..4f4e9ea6242 100644
--- a/java/webclient/src_moz/motif/NativeLoaderStub.cpp
+++ b/java/webclient/src_moz/motif/NativeLoaderStub.cpp
@@ -24,7 +24,7 @@
  * BrowserControlNativeShimStub.cpp
  */
 
-// PENDING(mark): I suppose this is where I need to go into my explaination of why
+// PENDING(mark): I suppose this is where I need to go into my explanation of why
 // this file is needed...
 
 // Ashu