UA is overwritten by UA Switcher when using Responsive Design Mode

[Xenapte]

When using the Responsive Design Mode (in which you can specify the UA; Ctrl + Shift + M) in Firefox, UA is still overwritten by the settings in UserAgent Switcher, i.e. you cannot get mobile views by using this mode if you have specified another UA string in UA Switcher. Yes, I know you can go around by simply switching UA Switcher off or setting it directly to a mobile UA, but it's just a little inconvienent for web developers who just wants to quickly test how the site looks like on mobile UAs.

[thewizrd2]

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