I have been in touch with support multiple times on browser crashes, here's a list of things that I can guarantee will crash Sidekick on my device:
1. sharing browser tab on video calls (resorted to sharing windows or screens)
2. opening a link from 1Password extension
among other things. In addition to other crashes which I can't explain.

I'd also sometimes have sites not loading for no obvious reason.

Annoyingly, when it crashes, it also removes all my apps, so I have to add them again. It's even more challenging adding Slack, because, by default, they take over my status updates! And there is no way to configure a setting for this, I'm having to do it every time I add the app.

I was a big proponent of Sidekick and was recommending it to others, I particularly loved the sessions feature, but it's been a big downgrade to my productivity, I regret my purchase and that I stuck with them for this long hoping for things to improve.

I'd not recommend this.