For Firefox, I found this extension [1] which is really a step-up from the build-in source viewer. [1]: https://addons.mozilla.org/en-US/firefox/addon/fire-sou

For Firefox, I found this extension [1] which is really a step-up from the build-in source viewer. [1]: https://addons.mozilla.org/en-US/firefox/addon/fire-source-viewer/ https://addons.mozilla.org/en-US/firefox/addon/fire-source-v...