diff --git a/README.md b/README.md
index 97db68d36..f12fce934 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,6 @@
-# pdf.js
+# PDF.JS
 
 
-
-## Overview
-
 pdf.js is an HTML5 technology experiment that explores building a faithful
 and efficient Portable Document Format (PDF) renderer without native code 
 assistance.
@@ -16,7 +13,7 @@ successful.
 
 
 
-## Getting started
+# Getting started
 
 ### Online demo
 
@@ -29,11 +26,12 @@ using the pdf.js API.
 
 ### Extension
 
-An up-to-date Firefox extension is also available:
+A Firefox extension is also available:
 
 + http://mozilla.github.com/pdf.js/extensions/firefox/pdf.js.xpi
 
-(The above link is updated upon every merge to our master branch).
+Note that this extension is self-updating, and by default Firefox will auto-update extensions on a 
+daily basis (you can change this through the `extensions.update.interval` option in `about:config`).
 
 For an experimental Chrome extension, get the code as explained below and issue `make extension`. 
 Then open Chrome with the flag `--enable-experimental-extension-apis`, go to `Tools > Extension`
@@ -68,12 +66,12 @@ In order to bundle all `src/` files into a final `pdf.js`, issue:
 This will generate the file `build/pdf.js` that can be included in your final project. (WARNING: That's a large file! Consider minifying it).
 
 
-## Learning
+# Learning
 
 Here are some initial pointers to help contributors get off the ground. 
 Additional resources are available in a separate section below.
 
-#### Hello world
+### Hello world
 
 For a "hello world" example, take a look at:
 
@@ -82,7 +80,7 @@ For a "hello world" example, take a look at:
 This example illustrates the bare minimum ingredients for integrating pdf.js
 in a custom project.
 
-#### Introductory video
+### Introductory video
 
 Check out the presentation by our contributor Julian Viereck on the inner 
 workings of PDF and pdf.js:
@@ -92,7 +90,7 @@ workings of PDF and pdf.js:
 
 
 
-## Contributing
+# Contributing
 
 pdf.js is a community-driven project, so contributors are always welcome. 
 Simply fork our repo and contribute away. Good starting places for picking
@@ -122,7 +120,7 @@ You can add your name to it! :)
 
 
 
-## Running the tests
+# Running the tests
 
 pdf.js comes with browser-level regression tests that allow one to probe 
 whether it's able to successfully parse PDFs, as well as compare its output
@@ -148,7 +146,7 @@ images. The test type `load` simply tests whether the file loads without
 raising any errors.
 
 
-## Running tests through our bot
+### Running tests through our bot
 
 If you are a reviewer, you can use our remote bot to issue comprehensive tests 
 against reference images before merging pull requests.
@@ -158,7 +156,7 @@ See the bot repo for details:
 + https://github.com/mozilla/pdf.js-bot
 
 
-## Additional resources
+# Additional resources
 
 Gallery of user projects and modifications:
 
@@ -188,7 +186,7 @@ Follow us on twitter: @pdfjs
   
   
   
-## PDF-related resources
+### PDF-related resources
 
 A really basic overview of PDF is described here:
 
diff --git a/src/canvas.js b/src/canvas.js
index 4feac4efe..5ef900861 100644
--- a/src/canvas.js
+++ b/src/canvas.js
@@ -48,6 +48,7 @@ var CanvasExtraState = (function CanvasExtraStateClosure() {
     // Note: fill alpha applies to all non-stroking operations
     this.fillAlpha = 1;
     this.strokeAlpha = 1;
+    this.lineWidth = 1;
 
     this.old = old;
   }
@@ -329,6 +330,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
 
     // Graphics state
     setLineWidth: function canvasGraphicsSetLineWidth(width) {
+      this.current.lineWidth = width;
       this.ctx.lineWidth = width;
     },
     setLineCap: function canvasGraphicsSetLineCap(style) {
@@ -442,6 +444,8 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
       consumePath = typeof consumePath !== 'undefined' ? consumePath : true;
       var ctx = this.ctx;
       var strokeColor = this.current.strokeColor;
+      if (this.current.lineWidth === 0)
+        ctx.lineWidth = this.getSinglePixelWidth();
       // For stroke we want to temporarily change the global alpha to the
       // stroking alpha.
       ctx.globalAlpha = this.current.strokeAlpha;
@@ -640,7 +644,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
         ctx.translate(current.x, current.y);
 
         ctx.scale(textHScale, 1);
-        ctx.lineWidth /= current.textMatrix[0];
 
         if (textSelection) {
           this.save();
@@ -677,7 +680,15 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
       } else {
         ctx.save();
         this.applyTextTransforms();
-        ctx.lineWidth /= current.textMatrix[0] * fontMatrix[0];
+
+        var lineWidth = current.lineWidth;
+        var scale = Math.abs(current.textMatrix[0] * fontMatrix[0]);
+        if (scale == 0 || lineWidth == 0)
+          lineWidth = this.getSinglePixelWidth();
+        else
+          lineWidth /= scale;
+
+        ctx.lineWidth = lineWidth;
 
         if (textSelection)
           text.geom = this.getTextGeometry();
@@ -1142,6 +1153,10 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
     },
     restoreFillRule: function canvasGraphicsRestoreFillRule(rule) {
       this.ctx.mozFillRule = rule;
+    },
+    getSinglePixelWidth: function getSinglePixelWidth(scale) {
+      var inverse = this.ctx.mozCurrentTransformInverse;
+      return Math.abs(inverse[0] + inverse[2]);
     }
   };
 
diff --git a/src/fonts.js b/src/fonts.js
index 616521a16..f96c15458 100644
--- a/src/fonts.js
+++ b/src/fonts.js
@@ -3340,15 +3340,9 @@ var Type2CFF = (function Type2CFFClosure() {
         inverseEncoding[encoding[charcode]] = charcode | 0;
       for (var i = 0, ii = charsets.length; i < ii; i++) {
         var glyph = charsets[i];
-        if (glyph == '.notdef') {
-          charstrings.push({
-            unicode: 0,
-            code: 0,
-            gid: i,
-            glyph: glyph
-          });
+        if (glyph == '.notdef')
           continue;
-        }
+
         var code = inverseEncoding[i];
         if (!code || isSpecialUnicode(code)) {
           unassignedUnicodeItems.push(i);
diff --git a/src/parser.js b/src/parser.js
index fec71f915..4a884e0d4 100644
--- a/src/parser.js
+++ b/src/parser.js
@@ -253,6 +253,9 @@ var Parser = (function ParserClosure() {
       if (name == 'CCITTFaxDecode' || name == 'CCF') {
         return new CCITTFaxStream(stream, params);
       }
+      if (name == 'RunLengthDecode') {
+        return new RunLengthStream(stream);
+      }
       warn('filter "' + name + '" not supported yet');
       return stream;
     }
diff --git a/src/stream.js b/src/stream.js
index cff83357a..610a54d38 100644
--- a/src/stream.js
+++ b/src/stream.js
@@ -1142,6 +1142,51 @@ var AsciiHexStream = (function AsciiHexStreamClosure() {
   return AsciiHexStream;
 })();
 
+var RunLengthStream = (function RunLengthStreamClosure() {
+  function RunLengthStream(str) {
+    this.str = str;
+    this.dict = str.dict;
+
+    DecodeStream.call(this);
+  }
+
+  RunLengthStream.prototype = Object.create(DecodeStream.prototype);
+
+  RunLengthStream.prototype.readBlock = function runLengthStreamReadBlock() {
+    // The repeatHeader has following format. The first byte defines type of run
+    // and amount of bytes to repeat/copy: n = 0 through 127 - copy next n bytes
+    // (in addition to the second byte from the header), n = 129 through 255 -
+    // duplicate the second byte from the header (257 - n) times, n = 128 - end.
+    var repeatHeader = this.str.getBytes(2);
+    if (!repeatHeader || repeatHeader.length < 2 || repeatHeader[0] == 128) {
+      this.eof = true;
+      return;
+    }
+
+    var bufferLength = this.bufferLength;
+    var n = repeatHeader[0];
+    if (n < 128) {
+      // copy n bytes
+      var buffer = this.ensureBuffer(bufferLength + n + 1);
+      buffer[bufferLength++] = repeatHeader[1];
+      if (n > 0) {
+        var source = this.str.getBytes(n);
+        buffer.set(source, bufferLength);
+        bufferLength += n;
+      }
+    } else {
+      n = 257 - n;
+      var b = repeatHeader[1];
+      var buffer = this.ensureBuffer(bufferLength + n + 1);
+      for (var i = 0; i < n; i++)
+        buffer[bufferLength++] = b;
+    }
+    this.bufferLength = bufferLength;
+  };
+
+  return RunLengthStream;
+})();
+
 var CCITTFaxStream = (function CCITTFaxStreamClosure() {
 
   var ccittEOL = -2;
diff --git a/test/.gitignore b/test/.gitignore
index e69de29bb..9fec7b584 100644
--- a/test/.gitignore
+++ b/test/.gitignore
@@ -0,0 +1,3 @@
+ref/
+tmp/
+
diff --git a/test/pdfs/.gitignore b/test/pdfs/.gitignore
index 2817f17d3..e0926492b 100644
--- a/test/pdfs/.gitignore
+++ b/test/pdfs/.gitignore
@@ -23,3 +23,4 @@
 !smaskdim.pdf
 !type4psfunc.pdf
 !S2.pdf
+!zerowidthline.pdf
diff --git a/test/pdfs/zerowidthline.pdf b/test/pdfs/zerowidthline.pdf
new file mode 100644
index 000000000..379f18049
Binary files /dev/null and b/test/pdfs/zerowidthline.pdf differ
diff --git a/test/test_manifest.json b/test/test_manifest.json
index fce77e0b2..5bc344abf 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -176,7 +176,6 @@
        "md5": "eb7b224107205db4fea9f7df0185f77d",
        "link": true,
        "rounds": 1,
-       "skipPages": [12,31],
        "type": "eq"
     },
     {  "id": "fips197",
@@ -423,5 +422,12 @@
       "rounds": 1,
       "link": true,
       "type": "eq"
+    },
+    {  "id": "zerowidthline",
+      "file": "pdfs/zerowidthline.pdf",
+      "md5": "295d26e61a85635433f8e4b768953f60",
+      "rounds": 1,
+      "link": false,
+      "type": "eq"
     }
 ]