Is navigator.msLaunchUri() a defined function that calls a standard function? What is the action function call that triggers the dialog?

I'm going to assume something like

window.open('dctmctf://blahblah');

Firefox usually can handle novel protocols automatically if they can be found in the Windows registry. However, Firefox still might display a confirmation dialog the first time before the user's preference has been recorded.

Possibly there is a setting defined via the new "Firefox for Enterprise" features. The relevant articles are here:

https://support.mozilla.org/products/firefox-enterprise/customization-firefox-enterprise-environment

We can ask a moderator to move this thread to that board.

Thanks for the response @jscher2000.

we are not having window.open('dctmctf://blahblah'); & navigator.msLaunchUri() is expected to launch an App. Refer https://developer.mozilla.org/en-US/docs/Web/API/MSLaunchUri

We are creating required registry entries in Windows. HKCU\Software\Classes\dctmctf and it contains \shell\open\command.

With these registry keys in place, we expect Firefox to shell open the command specified as part of registry keys, but firefox ESR is showing a dialog box, that novice end-users may not be able to handle. Our Web Application is going to used by 1000s of end-users. We are looking if either an about:config option or some GPO kind of option that IT Admin can handle so that end-user intervention is avoided.

The reason I asked about how the function was implemented was when I tried this in the console --

navigator.msLaunchUri('https://support.mozilla.org/');

-- it told me:

TypeError: navigator.msLaunchUri is not a function

But finding out the answer might not have any effect on your problem, so never mind.

Try to ask advice at the Stack Overflow forum site.

• http://stackoverflow.com/questions/
• https://support.mozilla.org/en-US/kb/where-go-developer-support

to add more details to my original question:

We are creating a new iframe and then trying to open the custom URL on that IFrame. customProtocolUri = dctmctf://blahblah myIframe.contentWindow.location.href = customProtocolUri // This is where it tries to launch the custom URI.

Request the experts to advice on this issue at the earliest

anyone has an answer for this question?

I don't think any support volunteers have knowledge of these particular internals.

Looking at your original screenshot, it seems Firefox is saying there is not an association defined for the protocol at the system level. Is your application installer creating a key for dctmctf under this key:

HKEY_CLASSES_ROOT\PROTOCOLS\Handler

Maybe there is some other relevant place in Windows 10.

We are creating following registry entries. With these registry keys, IE-11, Edge & Chrome launches the App properly.

HKCU,SOFTWARE\Classes\%Protocol%,,,"URL:Documentum DCTMCTF Protocol" HKCU,SOFTWARE\Classes\%Protocol%,"URL Protocol","" HKCU,SOFTWARE\Classes\%Protocol%\DefaultIcon,,,"DCMApp.exe,1" HKCU,SOFTWARE\Classes\%Protocol%\shell\open\command,,%REG_EXPAND_SZ%,%53%\%ContentXferFolder%\%HostName%\%AppVersion%\DCMApp.exe """%1"""

Above, %Protocol% is dctmctf

After creating those keys, does dctmctf show up under any of these? I don't know that it needs to, but when I look, for example, for the ftp and mailto protocols, they show up here:

HKEY_CLASSES_ROOT\PROTOCOLS\Handler HKEY_LOCAL_MACHINE\SOFTWARE\Classes\PROTOCOLS\Handler

HKEY_CLASSES_ROOT\Wow6432Node\PROTOCOLS\Handler HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\PROTOCOLS\Handler