On Linux Firefox we use ALT+N to swap between tabs instead of CTRL+N like on Windows or CMD+N like on OSX. For whatever reason FF allows sites to override this and it's annoying lal.
Maybe you could introduce a setting to control the bind or maybe even check the UA and choose layout based on that? Honestly anything is appreciated, thank you:) 💜
Oh and if y'all are busy I would have time to make a PR for this tomorrow if wanted ^^