diff --git a/gulpfile.js b/gulpfile.js
index a8a8425f1..a0bc0eb54 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -71,6 +71,20 @@ var builder = require('./external/builder/builder.js');
 var CONFIG_FILE = 'pdfjs.config';
 var config = JSON.parse(fs.readFileSync(CONFIG_FILE).toString());
 
+// Default Autoprefixer config used for generic, components, minifed-pre
+var AUTOPREFIXER_CONFIG = {
+  browsers: [
+    'last 2 versions',
+    'Chrome >= 49', // Last supported on Windows XP
+    'Firefox >= 52', // Last supported on Windows XP
+    'Firefox ESR',
+    'IE >= 11',
+    'Safari >= 8',
+    '> 0.5%',
+    'not dead',
+  ],
+};
+
 var DEFINES = {
   PRODUCTION: true,
   // The main build targets:
@@ -579,7 +593,7 @@ gulp.task('generic', ['buildnumber', 'locale'], function () {
     preprocessHTML('web/viewer.html', defines)
         .pipe(gulp.dest(GENERIC_DIR + 'web')),
     preprocessCSS('web/viewer.css', 'generic', defines, true)
-        .pipe(postcss([autoprefixer()]))
+        .pipe(postcss([autoprefixer(AUTOPREFIXER_CONFIG)]))
         .pipe(gulp.dest(GENERIC_DIR + 'web')),
 
     gulp.src('web/compressed.tracemonkey-pldi-09.pdf')
@@ -605,7 +619,7 @@ gulp.task('components', ['buildnumber'], function () {
     createComponentsBundle(defines).pipe(gulp.dest(COMPONENTS_DIR)),
     gulp.src(COMPONENTS_IMAGES).pipe(gulp.dest(COMPONENTS_DIR + 'images')),
     preprocessCSS('web/pdf_viewer.css', 'components', defines, true)
-        .pipe(postcss([autoprefixer()]))
+        .pipe(postcss([autoprefixer(AUTOPREFIXER_CONFIG)]))
         .pipe(gulp.dest(COMPONENTS_DIR)),
   ]);
 });
@@ -633,7 +647,7 @@ gulp.task('minified-pre', ['buildnumber', 'locale'], function () {
     preprocessHTML('web/viewer.html', defines)
         .pipe(gulp.dest(MINIFIED_DIR + 'web')),
     preprocessCSS('web/viewer.css', 'minified', defines, true)
-        .pipe(postcss([autoprefixer()]))
+        .pipe(postcss([autoprefixer(AUTOPREFIXER_CONFIG)]))
         .pipe(gulp.dest(MINIFIED_DIR + 'web')),
 
     gulp.src('web/compressed.tracemonkey-pldi-09.pdf')
@@ -724,7 +738,9 @@ gulp.task('mozcentral-pre', ['buildnumber', 'locale'], function () {
     preprocessHTML('web/viewer.html', defines)
         .pipe(gulp.dest(MOZCENTRAL_CONTENT_DIR + 'web')),
     preprocessCSS('web/viewer.css', 'mozcentral', defines, true)
-        .pipe(postcss([autoprefixer()]))
+        .pipe(postcss([
+            autoprefixer({ browsers: ['last 1 firefox versions'], })
+        ]))
         .pipe(gulp.dest(MOZCENTRAL_CONTENT_DIR + 'web')),
 
     gulp.src(FIREFOX_EXTENSION_DIR + 'locale/en-US/*.properties')
@@ -772,7 +788,7 @@ gulp.task('chromium-pre', ['buildnumber', 'locale'], function () {
     preprocessHTML('web/viewer.html', defines)
         .pipe(gulp.dest(CHROME_BUILD_CONTENT_DIR + 'web')),
     preprocessCSS('web/viewer.css', 'chrome', defines, true)
-        .pipe(postcss([autoprefixer()]))
+        .pipe(postcss([autoprefixer({ browsers: ['chrome >= 49'], })]))
         .pipe(gulp.dest(CHROME_BUILD_CONTENT_DIR + 'web')),
 
     gulp.src('LICENSE').pipe(gulp.dest(CHROME_BUILD_DIR)),