I've seen the same tip elsewhere and tried, but didn't work for me. What did (seem to) help was setting app.normandy.run_interval_seconds to a small value (21)

I've seen the same tip elsewhere and tried, but didn't work for me. What did (seem to) help was setting app.normandy.run_interval_seconds to a small value (21). At least just a couple of seconds after I did, all my addons came back. Edit: plugins -> addons