Is it possibe to make Pale Moon handle MS Teams invitation links and launch the Teams client?

[UCyborg]

The question in title, like how Edge does it. Well, Firefox can do it as well it seems. No idea how, there's no "msteams" specified on the settings page with file->program associations.

I'm not sure, could be something messed up on my end, Interlink mail client is actually able to launch MS Teams from the invitation link.

[moonbat]

If I recall, someone here made an extension to edit the file associations page but I don't remember the name.

[Kerebron]

There's one for adding new MIME types, very unexpectedly called NewMIME.

[vannilla]

There's one for adding new MIME types, very unexpectedly called NewMIME.

That extension will only accept MIME specs, i.e. <type>/<name> (notice the forward slash) as explained in the description.
If MS Teams handles are not codified like that you cannot use it. I don't know if they are and I didn't look them up.
It's why I didn't suggest it earlier (I'm the author).

[Moonchild]

MS Teams should have registered itself as a protocol handler. If that is the case, then you will see an entry for it in preferences->Applications. If not, then maybe reinstalling the teams app will fix that.

[UCyborg]

I don't know how those links are supposed to work. They're plain HTTPS links leading to a web page where you can choose to use Teams in a web browser or launch client application on computer. Except with Interlink, nothing is opened in web browser but Teams on computer is launched right away. But Pale Moon opens the page and when you click the button to launch Teams, nothing happens, no error in console either.

I didn't try to see what happens if you click to "Continue on this browser", I expect it won't be usable due to lack of WebRTC.

Considering both Pale Moon and Interlink are UXP based applications, it's puzzling what's the difference. Surely Interlink wouldn't be able to launch Teams if it wasn't registered?

[back2themoon]

I confirm the weirdness of these links, so I just open them in Edge, using the Open With extension in Epyrus.

[FranklinDM]

Known issue: Issue #2031 (UXP)

[Moonchild]

Oh, right. it's been a while so that slipped my mind -- and I thought this was just about a standard protocol link.
But if it's inside a sandboxed iframe... what do they really expect?

So, consider this a security feature of Pale Moon. No escaping the sandbox allowed!
I'm really apprehensive about punching a hole in the sandbox wall for this. Custom protocols are already a pretty big hazard as it is (it regularly pops up in CVEs).

[UCyborg]

So what's special about Interlink? I don't need it strictly in Pale Moon since I mostly open them from mail client, but in case that I open invitation mail in a browser; it's a bit silly to have to open Edge just to launch Teams.

[vannilla]

So what's special about Interlink?

Just a guess: links in e-mails are not handled through iframes so the program is able to call Teams without being blocked by security measures.

[Moonchild]

links in e-mails are not handled through iframes

In fact, html e-mails with iframes in them are commonly blocked by mail servers (because they are considered high-risk for foreign content inclusion in mail)