Oldie but goodie.
Though IMO "Responsive Design Mode" is underused in Firefox and kinda inconvenient to use, i.e. its name, the small window in which the web content is displayed by default, etc.
Hope this will get better...
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Yes, I agree. What's more, I believe Google's Chrome has a better support for developer tools in general which is why Chrome is preferred by (web) developers. I'm not sure if Mozilla can change this even by improving the developer tools in Firefox (could be too late).