Ah bummers, but nonetheless thanks for implementing this feature!
EDIT: I just took a look at GitHub's source code, and they mentioned a setting to turn off these shortcuts, and it really exists!! Under https://github.com/settings/accessibility one can turn off, all "Character keys" which means shortcuts without a modifier. I've never used them, so I just disabled it, and now forward slash always opens the Firefox search :0
GitHub is what annoyed me enough to make the feature in the first place. It used to work reliably but they made it worse :(