Jan Horak

That looks interesting. Firefox sandbox is different than flatpak sandbox. Firefox is sandboxing critical part of the code (like code which can be executed on website), while flatpak is sandboxing...

@alexlarsson maybe there was some development in this issue lately? Do we need any specific permission to allow access the the GPU?

Running `flatpak run --device=dri org.mozilla.FirefoxNightly --no-remote` fix that, we might consider adding device=dri into our context.

Webcam support depends on https://github.com/flatpak/flatpak/issues/83

Could you please retest? There should be a new build of DevEdition already.

> So the question here is if firefox should try to use the portal for schemes that it otherwise supports by itself? It "supports" everything. There's always fallback to the...

The `localhost` is an extreme example for that but it falls into the same category like other schemes. The non-flatpak Firefox just query system for the handler by `g_app_info_get_default_for_uri_scheme` and...

> > So having a portal to which we can send a SystemDoYouHaveAppForThisScheme('scheme') and receive true/false would be really helpful there. Otherwise there won't be a support passing these urls...

This flaw basically make the Email command in the Nautilus unusable for any flatpaked mail client.

The same case is for the Thunderbird, it does not support mailto:&attachment extensions because of security reasons. Downstream bug: https://bugzilla.redhat.com/show_bug.cgi?id=2149883