How to Fix “DevTools Failed to Load Source Map” Error

Published: 03 May 2025
on channel: KDTechs

327

Are you seeing this error in Chrome DevTools?

DevTools failed to load source map: Could not load content for chrome-extension://... HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME

In this quick tutorial, I’ll show you exactly how to fix it, why it happens, and whether you need to worry about it. If you’re a web developer, JavaScript programmer, or just debugging something in Chrome, this will save you time and frustration!

Timestamps:
00:00 - Intro
00:25 - Why this error happens
01:15 - Fix 1: Disable problematic extensions
02:10 - Fix 2: Use clean Chrome profile
03:00 - Is this error dangerous?
04:00 - Final thoughts
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#DevToolsError #ChromeErrorFix #WebDevelopment #JavaScript #Debugging #ChromeDevTools #FrontendDev #CodeFix #ErrorFix

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