diff --git a/mozglue/android/APKOpen.cpp b/mozglue/android/APKOpen.cpp
index 37a08bb0121..cd59d8809de 100644
--- a/mozglue/android/APKOpen.cpp
+++ b/mozglue/android/APKOpen.cpp
@@ -81,6 +81,8 @@ enum StartupEvent {
 #undef mozilla_StartupTimeline_Event
 };
 
+using namespace mozilla;
+
 static uint64_t *sStartupTimeline;
 
 void StartupTimeline_Record(StartupEvent ev, struct timeval *tm)
@@ -651,7 +653,7 @@ loadGeckoLibs(const char *apkName)
   struct rusage usage1;
   getrusage(RUSAGE_THREAD, &usage1);
   
-  Zip *zip = new Zip(apkName);
+  RefPtr<Zip> zip = new Zip(apkName);
 
 #ifdef MOZ_CRASHREPORTER
   file_ids = (char *)extractBuf("lib.id", zip);
@@ -682,8 +684,6 @@ loadGeckoLibs(const char *apkName)
 #undef MOZLOAD
 #endif
 
-  delete zip;
-
 #ifdef MOZ_CRASHREPORTER
   free(file_ids);
   file_ids = NULL;
@@ -749,7 +749,7 @@ static void loadSQLiteLibs(const char *apkName)
     apk_mtime = status.st_mtime;
 #endif
 
-  Zip *zip = new Zip(apkName);
+  RefPtr<Zip> zip = new Zip(apkName);
   lib_mapping = (struct mapping_info *)calloc(MAX_MAPPING_INFO, sizeof(*lib_mapping));
 
 #ifdef MOZ_CRASHREPORTER
@@ -767,8 +767,6 @@ static void loadSQLiteLibs(const char *apkName)
 #undef MOZLOAD
 #endif
 
-  delete zip;
-
 #ifdef MOZ_CRASHREPORTER
   free(file_ids);
   file_ids = NULL;
diff --git a/mozglue/linker/ElfLoader.cpp b/mozglue/linker/ElfLoader.cpp
index 78782af432a..c18fd7d478e 100644
--- a/mozglue/linker/ElfLoader.cpp
+++ b/mozglue/linker/ElfLoader.cpp
@@ -318,7 +318,6 @@ ElfLoader::~ElfLoader()
         debug("ElfLoader::~ElfLoader(): Remaining handle for \"%s\" "
               "[%d direct refs, %d refs total]", (*it)->GetPath(),
               (*it)->DirectRefCount(), (*it)->refCount());
-        delete (*it);
       } else {
         debug("ElfLoader::~ElfLoader(): Unexpected remaining handle for \"%s\" "
               "[%d direct refs, %d refs total]", (*it)->GetPath(),
diff --git a/mozglue/linker/ElfLoader.h b/mozglue/linker/ElfLoader.h
index c234a42a715..d1e8c0d78cd 100644
--- a/mozglue/linker/ElfLoader.h
+++ b/mozglue/linker/ElfLoader.h
@@ -7,8 +7,6 @@
 
 #include <vector>
 #include <dlfcn.h>
-/* Until RefPtr.h stops using JS_Assert */
-#undef DEBUG
 #include "mozilla/RefPtr.h"
 #include "Zip.h"
 
@@ -98,7 +96,7 @@ public:
   {
     bool ret = false;
     if (directRefCnt) {
-      // ASSERT(directRefCnt >= mozilla::RefCounted<LibHandle>::refCount())
+      MOZ_ASSERT(directRefCnt <= mozilla::RefCounted<LibHandle>::refCount());
       if (--directRefCnt)
         ret = true;
       mozilla::RefCounted<LibHandle>::Release();
diff --git a/mozglue/linker/Mappable.cpp b/mozglue/linker/Mappable.cpp
index 39634293a11..9ea6b6af9cb 100644
--- a/mozglue/linker/Mappable.cpp
+++ b/mozglue/linker/Mappable.cpp
@@ -35,8 +35,8 @@ void *
 MappableFile::mmap(const void *addr, size_t length, int prot, int flags,
                    off_t offset)
 {
-  // ASSERT(fd != -1)
-  // ASSERT(! flags & MAP_SHARED)
+  MOZ_ASSERT(fd != -1);
+  MOZ_ASSERT(!(flags & MAP_SHARED));
   flags |= MAP_PRIVATE;
 
   void *mapped = ::mmap(const_cast<void *>(addr), length, prot, flags,
@@ -191,7 +191,7 @@ public:
 
   void *mmap(const void *addr, size_t length, int prot, int flags, off_t offset)
   {
-    // ASSERT(fd != -1)
+    MOZ_ASSERT(fd != -1);
 #ifdef ANDROID
     /* Mapping ashmem MAP_PRIVATE is like mapping anonymous memory, even when
      * there is content in the ashmem */
@@ -222,7 +222,7 @@ private:
 MappableDeflate *
 MappableDeflate::Create(const char *name, Zip *zip, Zip::Stream *stream)
 {
-  // ASSERT(stream->GetType() == Zip::Stream::DEFLATE)
+  MOZ_ASSERT(stream->GetType() == Zip::Stream::DEFLATE);
   _MappableBuffer *buf = _MappableBuffer::Create(name, stream->GetUncompressedSize());
   if (buf)
     return new MappableDeflate(buf, zip, stream);
@@ -238,8 +238,8 @@ MappableDeflate::~MappableDeflate() { }
 void *
 MappableDeflate::mmap(const void *addr, size_t length, int prot, int flags, off_t offset)
 {
-  // ASSERT(buffer)
-  // ASSERT(! flags & MAP_SHARED)
+  MOZ_ASSERT(buffer);
+  MOZ_ASSERT(!(flags & MAP_SHARED));
   flags |= MAP_PRIVATE;
 
   /* The deflate stream is uncompressed up to the required offset + length, if
diff --git a/mozglue/linker/Utils.h b/mozglue/linker/Utils.h
index 7d60f673df5..439843d19b8 100644
--- a/mozglue/linker/Utils.h
+++ b/mozglue/linker/Utils.h
@@ -9,6 +9,7 @@
 #include <stddef.h>
 #include <sys/mman.h>
 #include <unistd.h>
+#include "mozilla/Assertions.h"
 
 /**
  * On architectures that are little endian and that support unaligned reads,
@@ -280,7 +281,7 @@ public:
 
   void Init(const void *buf)
   {
-    // ASSERT(operator bool())
+    MOZ_ASSERT(contents == NULL);
     contents = reinterpret_cast<const T *>(buf);
   }
 
@@ -289,7 +290,7 @@ public:
    */
   const T &operator[](const idx_t index) const
   {
-    // ASSERT(operator bool())
+    MOZ_ASSERT(contents);
     return contents[index];
   }
 
@@ -346,7 +347,7 @@ public:
 
   void Init(const idx_t len)
   {
-    // ASSERT(length != 0)
+    MOZ_ASSERT(length == 0);
     length = len;
   }
 
@@ -372,8 +373,8 @@ public:
    */
   const T &operator[](const idx_t index) const
   {
-    // ASSERT(index < length)
-    // ASSERT(operator bool())
+    MOZ_ASSERT(index < length);
+    MOZ_ASSERT(operator bool());
     return UnsizedArray<T>::operator[](index);
   }
 
diff --git a/mozglue/linker/Zip.h b/mozglue/linker/Zip.h
index a9bb465b77f..f85fb7c83f4 100644
--- a/mozglue/linker/Zip.h
+++ b/mozglue/linker/Zip.h
@@ -10,8 +10,6 @@
 #include <vector>
 #include <zlib.h>
 #include "Utils.h"
-/* Until RefPtr.h stops using JS_Assert */
-#undef DEBUG
 #include "mozilla/RefPtr.h"
 
 /**