Markdown preview toggle shortcut conflict in firefox with the open private window shortcut

Indeed, ctrl+shift+p is used for both.

A simple local solution would be to add an other shortcut. For exemple ctrl+shift+e, with a "e" like "edit" (toggle mode).

Here is a sorted list of ctrl+shift+ keys already taken in a default Firefox configuration:

 elinks 'https://support.mozilla.org/t5/Basic-Browsing/Keyboard-shortcuts-Perform-common-Firefox-tasks-quickly/ta-p/3866' -dump  | grep 'Ctrl + Shift +' |sed -e's/.*Ctrl + Shift +//; s/command.*//'|sort 
 A
 C
 D
 Del
 Enter
 Enter
 G
 H
 I
 J
 K
 M
 N
 O
 P
 Page Down
 Page Up
 Q
 R
 S
 T
 Tab
 V
 W
 Y
 Z