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Is this feature natively built into the devtools of chrome or a chrome extension?

yes, quite hidden and complicated to set up though, because it needs to map the server stuff to the local file system.

ok, I think that's not available with firefox devtools, but in case your SPA is react based, I think that the react devtools addon has hot (and state preserving) reloading: https://addons.mozilla.org/en-US/firefox/addon/react-devtool...

btw, do you have a link? I wonder if this works with sass/less and uglify transpilers...