diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 992325c..3fe47e2 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -2,12 +2,13 @@ name: Node.js Unit Tests
 
 on:
   push:
+    branches:
+      - master
   pull_request:
 
 jobs:
   build-front:
     runs-on: ${{ matrix.os }}
-    continue-on-error: ${{ matrix.allow-failure || false }}
 
     strategy:
       matrix:
@@ -30,6 +31,7 @@ jobs:
 
     - name: Install and run tests
       run: npm install-ci-test
+      continue-on-error: ${{ matrix.allow-failure || false }}
 
     - name: Run CLI commands
       run: |
diff --git a/README.md b/README.md
index 47d4450..20e8b30 100644
--- a/README.md
+++ b/README.md
@@ -47,10 +47,23 @@ crx.load( path.resolve(__dirname, './myExtension') )
 ```
 
 ### ChromeExtension = require("crx")
-### crx = new ChromeExtension(attrs)
+### crx = new ChromeExtension(attrs?)
 
 This module exports the `ChromeExtension` constructor directly, which can take an optional attribute object, which is used to extend the instance.
 
+`attrs` is an optional object with advanced configuration elements:
+
+```js
+crx = new ChromeExtension({
+  // By default, we exclude bundling crx extensions within extensions
+  // You can change that, and ignore other files as well
+  ignore: ['*.crx']
+  // By default, it produces extensions compatible with CRX version 3 (since Chromium 64)
+  // CRX version 2 is for Chromium versions prior to 64
+  version: 3
+})
+```
+
 ### crx.load(path|files)
 
 Prepares the temporary workspace for the Chrome Extension located at `path` — which is expected to directly contain `manifest.json`.
diff --git a/src/index.js b/src/index.js
index b312c46..f8ad9a5 100644
--- a/src/index.js
+++ b/src/index.js
@@ -17,6 +17,7 @@ const DEFAULTS = {
   codebase: null,
   path: null,
   src: "**",
+  ignore: ["*.crx"],
   version: 3,
 };
 
@@ -157,7 +158,7 @@ class ChromeExtension {
         .glob(selfie.src, {
           cwd: selfie.path,
           matchBase: true,
-          ignore: ["*.pem", ".git", "*.crx"]
+          ignore: ["*.pem", ".git"].concat(selfie.ignore)
         })
         .finalize();
     });
diff --git a/test/index.js b/test/index.js
index 1d7733b..880cee6 100644
--- a/test/index.js
+++ b/test/index.js
@@ -86,6 +86,28 @@ TESTS.writeFile = function(t, opts){
   t.throws(() => crx.writeFile('/tmp/crx'));
 };
 
+TESTS.ignoreFiles = function(t, opts){
+  t.plan(1);
+
+  var crx = newCrx(Object.assign({
+    ignore: ['*.png']
+  }, opts));
+
+  crx.load().then(function(){
+    return crx.loadContents();
+  })
+  .then(function(packageData){
+    var entries = new Zip(packageData)
+    .getEntries()
+    .map(function(entry){
+      return entry.entryName;
+    })
+
+    t.deepEqual(entries, ['manifest.json']);
+  })
+  .catch(t.error.bind(t));
+};
+
 TESTS.loadContents = function(t, opts){
   t.plan(3);
 
@@ -127,7 +149,7 @@ TESTS.generateUpdateXML = function(t, opts){
   t.throws(() => new ChromeExtension({}).generateUpdateXML(), 'No URL provided for update.xml');
 
   var crx = newCrx(opts);
-  var expected = crx.version === 2 ? updateXml2 : updateXml3; 
+  var expected = crx.version === 2 ? updateXml2 : updateXml3;
 
   crx.pack().then(function(){
     var xmlBuffer = crx.generateUpdateXML();