This is a list of common device and screen resolutions for use in the built-in FireFox Responsive Web Design tool. Accessed through Tool -> Web Developer -> Responsive Design View
To replace the default preset with this preset:
Open Firefox
Type about:config in the URL bar
Search for "devtools.responsiveUI.presets"
Replace the "value" field by double-clicking to edit
Delete existing presets
Paste the content from the JSON file in the text box
Click "OK"
Hope this helps in testing various resolutions for responsive web design!!