Ctrl+Alt+* hotkeys doesn't work on non-English keyboard layouts

[Infocatcher]

Unfortunately this is platform "bug".

Example for Ctrl+Alt+V on Russian keyboard layout:
event.charCode: 1084
String.fromCharCode(event.charCode): м
event.keyCode: 0

So we can 1) change default hotkeys to Ctrl+Shift+* or 2) add ability to create many hotkeys for one action.

[Infocatcher]

Reason: https://developer.mozilla.org/en-US/docs/Gecko_Keypress_Event#charCode_of_DOM_keypress_event
So we can use only Ctrl+* and Ctrl+Shift+*. :(

[Infocatcher]

Explanation

New method:

extensions.privateTab.keysUseKeydownEvent = true
extensions.privateTab.key.openNewPrivateTab = "control alt VK_P"
extensions.privateTab.key.toggleTabPrivate = "control alt VK_V"

To use old method:

extensions.privateTab.keysUseKeydownEvent = false
extensions.privateTab.key.openNewPrivateTab = "control alt p"
extensions.privateTab.key.toggleTabPrivate = "control alt v"

And additional hotkeys for Russian keyboard layout:

extensions.privateTab.key.openNewPrivateTab#ru = "control alt з"
extensions.privateTab.key.toggleTabPrivate#ru = "control alt м"

See also notes in defaults/preferences/prefs.js