v1.0

.gitignore

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+*.zip

background.js

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+browser.webRequest.onBeforeRequest.addListener(
+  async (details) => {
+    const url = details.url;
+    const tabId = details.tabId;
+
+    const response = await fetch(url);
+    const html = await response.text();
+    const regex = /"name":"Datasheet","page_count":\d+,"url":"([^"]+)"/;
+    const match = html.match(regex);
+
+    if (match && match[1]) {
+      // use first match - it seems like octopart's html viewer can render
+      // multiple documents but i have not found an example of this.
+      browser.tabs.update(tabId, { url: match[1] });
+    }
+  },
+  { urls: ["https://octopart.com/datasheet/*"], types: ["main_frame"] },
+  ["blocking"]
+);

manifest.json

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+{
+  "manifest_version": 2,
+  "name": "Redirect Octopart datasheets",
+  "version": "1.0",
+
+  "description": "View the original datasheet PDF in the browser's native PDF viewer instead of the Octopart's HTML PDF viewer.",
+
+  "background": {
+    "persistent": true,
+    "scripts": ["background.js"]
+  },
+  "permissions": [
+    "webRequest",
+    "webRequestBlocking",
+    "https://octopart.com/datasheet/*"
+  ]
+}