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How to add custom resolutions in Firefox Responsive Mode

1. open about:config
2. look for devtools.responsiveUI.presets
3. paste the following string: `[{"key":"2560x1440","width":2560,"height":1440},{"key":"1920x1200","width":1920,"height":1200},{"key":"1680x1050","width":1680,"height":1050},{"key":"1600x1200","width":1600,"height":1200},{"key":"1600x900","width":1600,"height":900},{"key":"1440x900","width":1440,"height":900},{"key":"1366x768","width":1366,"height":768},{"key":"1280x1024","width":1280,"height":1024},{"key":"1280x800","width":1280,"height":800},{"key":"1280x768","width":1280,"height":768},{"key":"1152x864","width":1152,"height":864},{"key":"1024x768","width":1024,"height":768},{"key":"800x600","width":800,"height":600},{"key":"800x1280","width":800,"height":1280},{"key":"768x1024","width":768,"height":1024},{"key":"640x960","width":640,"height":960},{"key":"360x640","width":360,"height":640},{"key":"320x480","width":320,"height":480},{"key":"320x396","width":320,"height":396},{"key":"2