initial

.gitignore

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+*.zip
+/.idea

background.js

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+function downloadResource(info, tab) {
+  let url = info['srcUrl']
+
+  let filename = url.substring(url.lastIndexOf('/')+1)
+  if (filename.indexOf('?') !== false)
+    filename = filename.substring(0, filename.indexOf('?'))
+
+  chrome.downloads.download({
+    url,
+    filename,
+    saveAs: false
+  })
+}
+
+chrome.contextMenus.create({
+  "title": "Save to Downloads…",
+  "contexts": ["image"],
+  "onclick": downloadResource
+})

manifest.json

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+{
+  "manifest_version": 2,
+  "name": "Save images to Downloads",
+  "version": "1.0",
+  "background": {
+    "scripts": ["background.js"]
+  },
+  "permissions": ["downloads", "contextMenus"]
+}