BTW while I am talking about this topic on this website: are there any good tools like this for Linux? I recently moved from macOS to Linux (mostly) and good site-specific-browser app creation tools are one of the things I miss most.

(On Mac, I just bought this flotato thing, as it seems pretty good and promising, but I normally have been using Coherence X (a similar app) and there are others... I am not aware of any for Linux.)

Also check out Bumpr.app for Mac — it intercepts link clicks and lets you choose what browser to open them in. Would love that on Linux, as well.