I've updated my OSX to Mojave yesterday, and Chrome's jump to tab function stopped working. As I have a french keyboard, my default numbers are & é " ' ( § è ! ç à, and when hitting shift, 1234567890.
When I use Cmd + Shift + Number it works, but first, a two finger shortcut is better, and second, Cmd + Shift + 3-5 is already taken for screenshots.
Before my OS Upgrade, it all worked smoothly... Chrome doesn't seem to be friend with Mojave as I find it very slow as well...
Thanks for your help!