Enabling and disabling

There are three ways to enable Responsive Design Mode:

• Select "Responsive Design View" from the Web Developer submenu in the Firefox Menu (or Tools menu if you display the menu bar or are on OS X)
• Press the "Responsive Design View" button in the ToolBox's tool bar.
• Press Ctrl + Shift + M, (or Cmd + Opt + M on OS X)

and three ways to switch off Responsive Design Mode:

• Select the "Responsive Design View" menu item again
• Click the "close" button in the top-left corner of the window
• Press Ctrl + Shift + M, (or Cmd + Opt + M on OS X). Prior to Firefox 34, Escape would also close Responsive Design View.

When the page displays in Responsive Design Mode there is a tool bar across the top with a drop down selection menu similar to the other except the are no specific devices defined.

Nevertheless, you can check a sites responsiveness and make needed adjustments.

If you are using a Microsoft browser I can't really help you much except to say that there is a tool, all though, much less feature packed then other browsers. At least on "Edge" and Windows 10 there is.

Microsoft defines the display as "Windows Mobile" or "Desktop" and there is a manual adjustment selection that allows you to enter specifics.

Simply go the menu (three dots in top right) and select "Developer Tools."

If all else fails... what to do? what to do? Come see >>>