Update: the shortcut can be configured in v1.4.0. Hope you like it!

Sorry to hear that. Unfortunately there is no way for me to customize the shortcut based on locale at the moment.

Hopefully Firefox will support customizing the shortcut in a future version.

P.S. You can always download the code, change the shortcut, and load the extension in about:debugging.

If you are interested in actually getting a solution to your problem, then please consider letting the Firefox developers know by posting here: https://bugzilla.mozilla.org/show_bug.cgi?id=1421811