When we used reddit, and you found a link on Google or in an email that went to reddit.com, it would open up that link in Boost. Same for the email notifications when you got an inbox message or a comment reply - following the link opened up your inbox in Boost, not your web browser.

Since there are an almost infinite number of instances to match the URL for, is this behaviour just not possible with Lemmy, by the nature of the fediverse?

I think I remember Android having a manual option to set default apps for certain links, so I'm going to try and set Boost the default app for links starting with my home instance. Not sure if Boost will necessarily understand the links though and how to process it..