Some short questions to network protocol (Firefox)

Hello,
some short questions: Is it possible to create in an Firefox-AddOn an network protocol? Like player:// that triggers the network protocol popup and where the user self must choose an application or is this only possible with an entry in the operating system settings?
thx

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So tabs.update() functioned again in the newest update and the answer for my questions is:

Only an network protocol scheme to special html-page is possible with registerProtocols or manifest.

Only os-specified settings accept firefox as an out-of-firefox enviroment link and a os-special open as popup.