Error message "DevTools failed to load SourceMap: Could not load content for chrome-extension://..."

web-development

debugging

sourcemaps

webpack

To quickly get rid of the DevTools SourceMap warning,

Ignore the message: Usually, it's harmless and doesn't affect your code.
Manage extensions: If possible, update or disable extensions causing the message. Turn off SourceMap loading in Chrome:

DevTools -> Settings -> Experiments -> Uncheck 'Enable JavaScript source maps' and 'Enable CSS source maps'

This simple move eliminates the warning without compromising your web project's performance.

Are you interested in a deeper diagnosis and ways to fix it without turning off the SourceMaps? Here're your options:

Filter warning messages: In Chrome DevTools Console, select "Selected context only" to screen out unrelated SourceMap warnings.
Trace the extension: You can find the extension causing the warning by disabling each one temporarily.
Developer outreach: If you discover a troublemaker extension, let its developer know.
Remove the extension: If the extension is not crucial and keeps causing trouble, consider removing it permanently for a smooth workflow.
Track sourceMappingURL: If the warning origins from your code, handling //# sourceMappingURL=yourfile.js.map by commenting out or deleting the line might help.

Deep dive into debugging

A SourceMap warning doesn't mean your debugging has to suffer. Here're some more techniques to up your game:

Test with local images: Use functions like PreviewImage() to ensure local images load correctly.
Utilize the console: Make use of console.log. It's not just for debuggers but occasionally for comedians too. I mean, who doesn't want to debug with a smile? console.log("Why don't some fish play piano? They’re afraid of the keys!") We got you!
Try another browser: Some errors are more transparent in other browsers like Edge. Give it a shot.
Leverage Webpack: If you're a Webpack user, try using "devtool: 'source-map'". Better SourceMaps lead to better debugging, just like more cowbell leads to better music.