1279896 - Ctrl+Shift+M does not open Responsive Design Mode but wants to merge windows

Status: RESOLVED INVALID

(Firefox :: Keyboard Navigation, defect)

Description

[Jens]

User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:49.0) Gecko/20100101 /
Build ID: 20160612004006

Steps to reproduce:

Press Ctrl+Shift+M to open RDM


Actual results:

Windows are merged or if only one window open, then Error message:  "At least 2 windows have be be opened before you can merge them"


Expected results:

Open RDM. This bug/change seems to have been introduced with Fx 48. Still present in 49. Not present in Fx 47.

I'm on Windows 8.1.

Comment 1

[[:Towkir] Ahmed]

Can you visit about:config ? and search for devtools.responsiveUI.___________
try modifying them.

Comment 2

[Jens]

Attachment: Auswahl_100.png

Ahmed, here's a screenshot of what I see in about:config. I do not know what I could/should modify there. The available settings there look unrelated to this bug IMO.

Comment 3

[Jens]

Forgot to say: The screenshot is from Ubuntu 14.04 not Windows 8.1. But I have the problem on both systems with FDE 48/49.

Comment 4

[Dão Gottwald [:dao]]

Firefox doesn't provide a "merge windows" feature. Do you have an add-on installed that does that?

Comment 5

[Jens]

Dão , you're right. Thanks for looking it this! Tab Mix Plus was the culprit. I opened an issue for the add-on at https://bitbucket.org/onemen/tabmixplus/issues/29/ctrl-shift-m-overrides-responsive-design

Closing this here as "RESOLVED INVALID".