Firefox Nightly already supports this feature. You can share a link (possibly with a pic) through Windows 10 Share dialogue to cast the link to UWP apps.
I want to see this feature in this extension despite it is not required.
Development info: in Windows 8/8.1, it was necessary to register share contract in Windows, but now, in Windows 10, I guess every classic app can share content easily without any troubles.
I took a look into it, but I don't think it's possible. Native apps (either Win32 or UWP) can access the share contract, but since this is an extension, there is no way to access it.
Firefox Nightly already supports this feature. You can share a link (possibly with a pic) through Windows 10 Share dialogue to cast the link to UWP apps.
I want to see this feature in this extension despite it is not required.
Development info
: in Windows 8/8.1, it was necessary to register share contract in Windows, but now, in Windows 10, I guess every classic app can share content easily without any troubles.