> On 20 Jun 2024, at 20:52, debian-u...@howorth.org.uk wrote:
> Greg Wooledge <g...@wooledge.org> wrote:
>> On Thu, Jun 20, 2024 at 22:56:33 +0530, Pranjal Singh wrote:
>>> It runs regular Firefox after adding the -private-window flag.
>>> 
>>> To get a MWE, I made these changes later:
>>> - Exec=firefox -private-window %u
>>> - StartupWMClass=firefox
>>> +Exec=gnome-calculator  
>> 
>> Did you see Gareth's reply at
>> <https://lists.debian.org/debian-user/2024/06/msg00432.html>?
>> 
>> It's supposed to be --private-window with two leading hyphens, not
>> one, he said.
> 
> He was wrong according to Mozilla's documentation

My advice was based on

$ firefox -h | grep private
  --private-window <url> Open <url> in a new private window.
$

I did try (with Mate Desktop) with both single and double hyphens, both on the 
command line and in 

/usr/share/applications/firefox-esr.desktop

One hyphen failed to have the desired effect, but works when I try it now.  
Firefox hasn't been updated here since, so there seem to be other variables 
involved.

I would be inclined to take it from the firefox help grep results above that 
the double-hyphen form should always work.

I think the wiki is out of date - cf.

"-private
Opens Firefox in permanent private browsing mode ...

-private-window
Opens a new private browsing window in an existing instance of Firefox ..."

https://wiki.mozilla.org/Firefox/CommandLineOptions#Command_line_options

There is no "[-]-private" option according to the grep I performed, and 
[-]-private  produces a non-private window when run here from the command line.

$ apt policy firefox-esr
firefox-esr:
  Installed: 115.12.0esr-1~deb12u1
  Candidate: 115.12.0esr-1~deb12u1
  Version table:
 *** 115.12.0esr-1~deb12u1 500
        500 https://security.debian.org/debian-security bookworm-security/main 
amd64 Packages
[...]

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