Restarted computer and Add-ons disappeared

[aronos]

Here’s some info that may be related:

Tiller Add-On just says "Install" but it's already installed

We are aware that there is an issue with installed add-ons not appearing as installed in the add-ons issue. It seems to be intermittent and quitting and restarting Chrome worked for me. This is a Google issue. We’re not seeing anything official from Google on this, but we’re monitoring.