Installing Printers with Firefox does not work any more

[mguldner]

iPrint Client v6.20 iPrint on OES 2018 SP1

Some Windows systems can't install iPrint printers with Firefox. Windows 10 2004 and Windows 10 20H2. After installing iPrint Client this application setting for iPrint is missing in Firefox settings:

My guess (!) is that whether it works or not depends on when the system or Firefox or iPrint Client was installed. It does not work on recently installed systems, but it works on older systems, even when Windows, Firefox and iPrint Client are updated to the latest versions.

Any ideas what the reason for this problem is?

Thanks,

Mirko

[gmorera]

handlers.json non working:

"uriTemplate":"https://mail.google.com/mail/?extsrc=mailto&url=%s"}]}}}

if i manually add "iprint":{"action":4}}} to the non working, then it works
again.The last two }} before iprint needs to be removed as well so it looks
like:

extsrc=mailto&url=%s"}]},"iprint":{"action":4}}}

[mathiasbraun]

I have this entry. Nevertheless all current blends of FF (ESR and mainstream) are affected. No issues with IE and Edge.

Strange.

[gmorera]

mguldner reported positive results with the entry and i was able to duplicate it and fix in this way.

Be aware that, if you enter an invalid command or character in the json file, firefox will mark the .json as corrupt and it will create a new one default, so issue still be present. 

Assuming it is the same issue as reported by mguldner .

[mathiasbraun]

I've seen instances where the entry was entirely missing. But in the majority of cases the entry exists, e.g.

{"defaultHandlersVersion":{"en-US":4},"mimeTypes":{"application/pdf":{"action":3,"extensions":["pdf"]},"application/zip":{"action":0,"ask":true,"extensions":["zip"]}},"schemes":{"ircs":{"action":2,"ask":true,"handlers":[null,{"name":"Mibbit","uriTemplate":"https://www.mibbit.com/?url=%s"}]},"mailto":{"action":4,"handlers":[null,{"name":"Yahoo! Mail","uriTemplate":"https://compose.mail.yahoo.com/?To=%s"},{"name":"Gmail","uriTemplate":"https://mail.google.com/mail/?extsrc=mailto&url=%s"}]},"irc":{"action":2,"ask":true,"handlers":[null,{"name":"Mibbit","uriTemplate":"https://www.mibbit.com/?url=%s"}]},"iprint":{"action":4}}}