Disable auto refresh when switching to Responsive Design Mode in Firefox?

To adjust my site CSS, I often go in developer mode and adjust CSS directly there to have a live preview. but then, I want to switch responsive design mode on or off to see if other display is not broken by what I just edited. Unfortunately, it reloads the page and discard all modifications I had just done.

How to avoid auto reload of the page in Firefox when toggling Responsive Design Mode on or off?

Solution

There are two options Reload when touch simulation is toggled and Reload when user agent is changed that cause the page to reload automatically when enabled.

If you disable those two options the page should not get reloaded when switching to Responsive Design Mode.