Firefox does not start the extension when it's Home Page - it has to be reloaded manually

I am trying to run the Distill Firefox extension as a “web app” i.e. in its own instance of Firefox. The extension URI is assigned as Home Page, so it should work. However, the extension does not actually load on Firefox startup - it displays the URI in the address bar and just sits there. It requires a page refresh (Ctrl-R) to show the Watchlist. Is this something that can be remedied?

(Firefox 138.0.1 on Linux Mint 22.1)

@morciej is using chromium instead of firefox? firefox addon updates are currently not being published at amo. we plan to publish distill hosted version later this year.