diff --git a/nsprpub/lib/libc/include/plresolv.h b/nsprpub/lib/libc/include/plresolv.h
index 45d4e5e6e00..8e8926c6c16 100644
--- a/nsprpub/lib/libc/include/plresolv.h
+++ b/nsprpub/lib/libc/include/plresolv.h
@@ -66,7 +66,7 @@ NSPR_BEGIN_EXTERN_C
 #define PL_RESOLVE_ETIMEDOUT     4           /* Request timed-out */
 #define PL_RESOLVE_EINVAL        5           /* Invalid argument */
 #define PL_RESOLVE_EOVERFLOW     6           /* Buffer Overflow */
-#define PL_RESOLVE_EUNKNOWN      7           /* berzerk error */
+#define PL_RESOLVE_EUNKNOWN      7           /* berserk error */
 
 /* ----------- Function Prototypes ----------------*/
 
diff --git a/nsprpub/lib/libc/include/plstr.h b/nsprpub/lib/libc/include/plstr.h
index 53746ce699c..398a535615b 100644
--- a/nsprpub/lib/libc/include/plstr.h
+++ b/nsprpub/lib/libc/include/plstr.h
@@ -48,7 +48,7 @@
  * This API was not designed as an "optimal" or "ideal" string library; it 
  * was based on the good ol' unix string.3 functions, and was written to
  *
- *  1) replace the libc functions, for cross-platform consistancy, 
+ *  1) replace the libc functions, for cross-platform consistency, 
  *  2) complete the API on platforms lacking common functions (e.g., 
  *     strcase*), and
  *  3) to implement some obvious "closure" functions that I've seen
@@ -418,7 +418,7 @@ PL_strcaserstr(const char *big, const char *little);
 /*
  * PL_strncasestr
  *
- * Returns a pointer to the first instance of the listtle string within the first
+ * Returns a pointer to the first instance of the little string within the first
  * n characters of the big one, ignoring case.  It returns null if either string is 
  * null.  It returns null if the length of the little string is greater than n.
  */
diff --git a/nsprpub/lib/msgc/include/prgc.h b/nsprpub/lib/msgc/include/prgc.h
index add30213409..859f7b1c0dd 100644
--- a/nsprpub/lib/msgc/include/prgc.h
+++ b/nsprpub/lib/msgc/include/prgc.h
@@ -320,7 +320,7 @@ PR_EXTERN(void) PR_DumpIndent(FILE *out, PRIntn indent);
 **    a pointer falls within the GC heap. [ see GC_IN_HEAP(...) ]
 **
 ** lock:
-**    Monitor used for syncronization within the GC.
+**    Monitor used for synchronization within the GC.
 **
 ** finalizer:
 **    Thread in which the GC finalizer is running.
@@ -352,7 +352,7 @@ typedef struct GCInfoStr {
     PRWord  allocMemory;   /* sum of busy & free memory             */
     PRWord  maxMemory;     /* max memory we are allowed to allocate */
     PRWord *lowSeg;        /* lowest segment in the GC heap         */
-    PRWord *highSeg;       /* higest segment in the GC heap         */
+    PRWord *highSeg;       /* highest segment in the GC heap         */
 
     PRMonitor *lock;
     PRThread  *finalizer;
diff --git a/nsprpub/pr/include/prolock.h b/nsprpub/pr/include/prolock.h
index 74b5ffe8962..d8aece986c5 100644
--- a/nsprpub/pr/include/prolock.h
+++ b/nsprpub/pr/include/prolock.h
@@ -159,7 +159,7 @@ NSPR_API(void)
 ** 
 ** INPUTS: lock: a pointer to a PROrderedLock
 ** 
-** OUTPUTS: The lock is held or the fucntion asserts.
+** OUTPUTS: The lock is held or the function asserts.
 ** 
 ** RETURNS: void
 ** 
diff --git a/nsprpub/pr/include/prtypes.h b/nsprpub/pr/include/prtypes.h
index 2770329c90a..6b9548817ac 100644
--- a/nsprpub/pr/include/prtypes.h
+++ b/nsprpub/pr/include/prtypes.h
@@ -39,8 +39,8 @@
 ** File:                prtypes.h
 ** Description: Definitions of NSPR's basic types
 **
-** Prototypes and macros used to make up for deficiencies in ANSI environments
-** that we have found.
+** Prototypes and macros used to make up for deficiencies that we have found
+** in ANSI environments.
 **
 ** Since we do not wrap <stdlib.h> and all the other standard headers, authors
 ** of portable code will not know in general that they need these definitions.
@@ -424,7 +424,7 @@ typedef PRInt64 PROffset64;
 ** TYPES:       PRPtrDiff
 ** DESCRIPTION:
 **  A type for pointer difference. Variables of this type are suitable
-**      for storing a pointer or pointer sutraction. 
+**      for storing a pointer or pointer subtraction. 
 ************************************************************************/
 typedef ptrdiff_t PRPtrdiff;
 
@@ -442,7 +442,7 @@ typedef unsigned long PRUptrdiff;
 **  Use PRBool for variables and parameter types. Use PR_FALSE and PR_TRUE
 **      for clarity of target type in assignments and actual arguments. Use
 **      'if (bool)', 'while (!bool)', '(bool) ? x : y' etc., to test booleans
-**      juast as you would C int-valued conditions. 
+**      just as you would C int-valued conditions. 
 ************************************************************************/
 typedef PRIntn PRBool;
 #define PR_TRUE 1
@@ -451,7 +451,7 @@ typedef PRIntn PRBool;
 /************************************************************************
 ** TYPES:       PRPackedBool
 ** DESCRIPTION:
-**  Use PRPackedBOol within structs where bitfields are not desireable
+**  Use PRPackedBool within structs where bitfields are not desirable
 **      but minimum and consistant overhead matters.
 ************************************************************************/
 typedef PRUint8 PRPackedBool;