How can I set my own screens in tools > Web Developer > sensitive design mode?

From this page, https://developer.mozilla.org/en-US/docs/Tools/Responsive_Design_View
I see that I can change the sizes in the drop down menu, but sounds like he accepts only one.
If I select 320 x 480 and change 414 x 736, he adds '414 x 736 (custom)' in the menu, and 320 x 480 is still there.
But if I reselect 320 x 480 and change it to 375 x 667, '375 x 667 (custom)' are added, but '414 x 736 (custom)' disappears.
Really, only the custom at a time format?
I have several.

Copied and pasted to devtools.responsiveUI.presets, works. Success!

Just to explain... Open devtools.responsiveUI.presets, right-click on edit, copied string in the text editor, in the values of text editor changed to what I need, then paste it in devtools.responsiveUI.presets

Tags: Firefox

Similar Questions

Maybe you are looking for

  • How can I restore my bookmarks from an HTML file?

    I just installed Ubuntu 11.04, and I want to restore my bookmarks from an HTML file. This used to be accessible through the "bookmarks - > organize bookmarks ' menu item 'Organize bookmarks' no longer exists so I'm stuck. This help system seems to th

  • Satellite M70: I can't connect to the WLan access point

    I have several wireless laptops, all work fine - except my M70.I use Intel Proset, and he sees the access point, but says "unable to connect" when I try.The signal is high (2 meters distance). I tried with WEP, WPA and without security. I am absolute

  • Satellite P875 - 31 c a m-SATA port?

    I searched for some ssd put in my laptop and I have considered using an msata ssd, but I haven't found any information on this model with a port msata or not. Thanks in advance. As a suggestion, it would be nice if you put all such information in cha

  • LabVIEW 2012 error 7 creating executable

    I try to create an executable file to run on a machine without LabVIEW installed on it.  I'm working through the steps of creating the project and to define the source of VI and build specifications.  When I say to build it makes almost all the way t

  • Why do I get ' Windows Live Mail error ID: ox8de2007 ".

    If I try to contact someone to a Web site. Live Mail won't send it. I get this error message