4 files changed, 97 insertions, 5 deletions
diff --git a/toolkit/components/thumbnails/BackgroundPageThumbs.jsm b/toolkit/components/thumbnails/BackgroundPageThumbs.jsm
index bd52e77e9..b2aa646f7 100644
--- a/toolkit/components/thumbnails/BackgroundPageThumbs.jsm
+++ b/toolkit/components/thumbnails/BackgroundPageThumbs.jsm
@@ -468,11 +468,9 @@ Capture.prototype = {
     };
 
     if (!data) {
-      // If this background attempt failed, cause a dummy file to be saved, so
+      // If this background attempt failed, cause a placeholder file to be saved, so
       // that gets loaded instead of attempting again (and again).
-      // XXX: Perhaps we can create a placeholder image to use instead of "null"
-      // here, so it has something to show to the user?
-      PageThumbs._store(this.url, this.url, null, true)
+      PageThumbs._store(this.url, this.url, atob(BLANKTHUMB), true)
                 .then(done, done);
       return;
     }
diff --git a/toolkit/components/thumbnails/PageThumbs.jsm b/toolkit/components/thumbnails/PageThumbs.jsm
index b0affee92..4b343c605 100644
--- a/toolkit/components/thumbnails/PageThumbs.jsm
+++ b/toolkit/components/thumbnails/PageThumbs.jsm
@@ -28,6 +28,9 @@ const MAX_THUMBNAIL_AGE_SECS = 172800; // 2 days == 60*60*24*2 == 172800 secs.
  */
 const THUMBNAIL_DIRECTORY = "thumbnails";
 
+// contains base64 version of a placeholder thumbnail
+#include "blankthumb.inc"
+
 Cu.import("resource://gre/modules/XPCOMUtils.jsm", this);
 Cu.import("resource://gre/modules/PromiseWorker.jsm", this);
 Cu.import("resource://gre/modules/Promise.jsm", this);
diff --git a/toolkit/components/thumbnails/blankthumb.inc b/toolkit/components/thumbnails/blankthumb.inc
new file mode 100644
index 000000000..06577c19c
--- /dev/null
+++ b/toolkit/components/thumbnails/blankthumb.inc
@@ -0,0 +1,87 @@
+const BLANKTHUMB =
+"iVBORw0KGgoAAAANSUhEUgAAASwAAADsCAAAAADricSpAAASn0lEQVR4XuzQQREAAAwCoPWvaolV" +
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+"+pcKOykhCXQqALS3igEDdq3NrWqJ+INgpamulHkuRYAQIQlkxbTjuLZcIQ3QtuZWPZXQnwTL67qq" +
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+"Y4TiyY1mHRmWKpRTq51/RArHXD5hLXNTCsBIisBe23S1dNwYVlsnXVBywqSYTgXAAhx8Rv2SGMvT" +
+"/2oiMBSYDtyz3IClZOc1vdDe9wmDCp+Us9jeLpa2X68XBDGhsA8Ky7i5zFxFCmcSPU+5lpUSfF34" +
+"+vO6vjU2N0MUgoPCMq2hkzpDOU7PT4FHo4U+AT5h09mnvf2q2o+UIOwjwrLc4BQwGwDm5x8v52Ue" +
+"Wz2fBGWMx8tCgNfaMJoUavbxYNGaXSay7c5P8ySb07lgjILPaMQ0EgMQUQBrImgHc1aGcAETYEwR" +
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+
diff --git a/toolkit/components/thumbnails/moz.build b/toolkit/components/thumbnails/moz.build
index 9bc218b6a..d4003c635 100644
--- a/toolkit/components/thumbnails/moz.build
+++ b/toolkit/components/thumbnails/moz.build
@@ -14,9 +14,13 @@ EXTRA_COMPONENTS += [
 
 EXTRA_JS_MODULES += [
     'BackgroundPageThumbs.jsm',
-    'PageThumbs.jsm',
     'PageThumbsWorker.js',
     'PageThumbUtils.jsm',
 ]
 
+EXTRA_PP_JS_MODULES += [
+    'PageThumbs.jsm',
+]
+
+
 JAR_MANIFESTS += ['jar.mn']