sanitize filename

background.js

@@ -4,6 +4,7 @@ function downloadResource(info, tab) {
   let filename = url.substring(url.lastIndexOf('/')+1)
   if (filename.indexOf('?') !== false)
     filename = filename.substring(0, filename.indexOf('?'))
+  filename = safeFileName(filename)
 
   chrome.downloads.download({
     url,
@@ -17,3 +18,9 @@ chrome.contextMenus.create({
   "contexts": ["image"],
   "onclick": downloadResource
 })
+
+function safeFileName(str) {
+  if (/[|"*?:<>]/.test(str))
+    str = str.replace(/[\/\\|"*?:<>]/g, '_');
+  return str
+}

manifest.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 2,
   "name": "Save images to Downloads",
-  "version": "1.0",
+  "version": "1.1",
   "background": {
     "scripts": ["background.js"]
   },