Why can I export (and import)the different sizes that I put in the "Responsive Design View"?

Question

Hello
I have troubles when try to import or export the different sizes of the Responsive Design View, I manage at least 13, and it's a little preposterous to add one by one. There are a method that export/import them?
Thanks

Answer 1

There is a way to store custom settings for responsive design.
You can create custom settings in the responsive design mode window.
You can hold down the Shift key and drag the borders via the (right border, bottom border, bottom right corner) resize icons to get specific dimensions and give the current custom setting a name to add them as a preset.
This will add the preset to the <b>devtools.responsiveUI.presets</b> pref that you can inspect on the <b>about:config</b> page.
Those settings are stored in JSON format.
<pre><nowiki>[{"key":"360x640","width":360,"height":640},{"key":"768x1024","width":768,"height":1024},{"key":"800x600","name":"8x6","width":800,"height":600},{"key":"800x1280","width":800,"height":1280},{"key":"980x1280","width":980,"height":1280},{"key":"1280x600","width":1280,"height":600},{"key":"1920x900","width":1920,"height":900}]</nowiki></pre>
See this thread for some JavaScript code to add extra sizes:
*[[/questions/957590]]
You can paste the existing JSON value of the devtools.responsiveUI.presets pref in the prompt and click OK.
Extra values can be added by typing its dimensions (<width>x<height> <name>).
You can paste the resulting JSON value back to the devtools.responsiveUI.presets pref or save it.