DevTools failed to load source map: Could not load content for [ Ссылка ]: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
Source maps allow browsers to load full versions of minified JS and CSS files. They are mostly used for debugging. If you want to disable the warning message, untick the Enable CSS and JS mapd under Settings(gear icon) , then Preferences.
Ещё видео!