DevTools failed to load SourceMap: Could not load content for chrome-extension://emnoomldgleagdjapdeckpmebokijail/lib/progressbar.min.js.map code example

Example: devtools failed to load sourcemap when debugging react native

Open Developer Tools, 
go to "Settings" for Developer Tools, 
then uncheck Enable JavaScript Sourcemaps under the "Sources" settings.
Restart Browser if needed