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Re:Firefox Developer Edition by acdha on Monday November 10, 2014 @11:03AM (#8584269)
I'd love it if the Responsive Design Mode had multiple viewport support so you could have the same page visible at multiple breakpoints simultaneously
Re:Firefox Developer Edition by at-fates-hands on Monday November 10, 2014 @12:06PM (#8584703)
Add my vote to this one.

Also, having more than 6 presets would be better. There's so many devices with different viewport sizes now. Chrome at least has a fairly deep list of devices you can test with their responsive tool. It would be nice to see a more robust list in the Developer Edition.

Re:Firefox Developer Edition by kristiandupont on Tuesday November 11, 2014 @04:28AM (#8589036)
This is not quite the same but still helpful: http://ami.responsivedesign.is/