[FIREFOX] YAFFeather fails to make me a sandwich (EXAMPLE BUG REPORT)

[rootabeta]

Browser: Firefox 114.0.2 (x64) on Arch Linux
YAFFeather Version(s): Firefox 3.6.7

Issue description:
YAFFeather does not make me a sandwich, no matter how hard I try.

Expected behavior:
When viewing https://www.nationstates.net/region=sandwich, pressing M should cause the CD tray on my computer to slide out, bearing a BLT.

Actual behavior:
YAFFeather does not appear to do anything. The CD tray remains shut, and if I want a BLT, I have to go to the kitchen and make it myself.

Reproduction:

1. Navigate to https://www.nationstates.net/region=sandwich
2. Press M
   A sandwich should appear at this point, but one does not.

More details, including console logs, other notes, etc.
Pressing F12 shows console output reading
XKCD parsing error: Cannot make sandwich without administrative permissions. (Error code 149)
Link to a stackoverflow thread discussing making a sandwich in Javascript: https://www.food.com/recipe/classic-blt-sandwich-129615