Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

Eheka Pytyvõha

Emboyke pytyvõha apovai. Ndorojeruremo’ãi ehenói térã eñe’ẽmondóvo pumbyrýpe ha emoherakuãvo marandu nemba’etéva. Emombe’u tembiapo imarãkuaáva ko “Marandu iñañáva” rupive.

Kuaave

Ko téma oñeñongatúma. Ejapo porandu pyahu eikotevẽramo pytyvõ.

Open external links in private-window

  • 4 Mbohovái
  • 2 oguereko ko apañuãi
  • 298 Hecha
  • Mbohovái ipaháva Yaron
  • Moĩporãmbyre

Yaron
Yaron

On Windows, Firefox adds a pre-set command line to the Windows registry under 

   HKEY_CLASSES_ROOT\FirefoxHTML\shell\open\command
   HKEY_CLASSES_ROOT\FirefoxURL\shell\open\command

If you change the -url in the command line to -private-window -- from

"C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -osint -url "%1"

to

"C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -osint -private-window "%1"

-- then all external links launch in a private window.

jscher2000 in https://support.mozilla.org/en-US/questions/1119073

This no longer works in FF 69. As soon as I modify "HKEY_CLASSES_ROOT\FirefoxURL-F66A7FFE1BF331E2\shell\open\command", FF is detecting it and changes its status to "NOT your default browser".

I'd appreciate your help.

On Windows, Firefox adds a pre-set command line to the Windows registry under HKEY_CLASSES_ROOT\FirefoxHTML\shell\open\command HKEY_CLASSES_ROOT\FirefoxURL\shell\open\command If you change the -url in the command line to -private-window -- from "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -osint -url "%1" to "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -osint -private-window "%1" -- then all external links launch in a private window. --------- jscher2000 in https://support.mozilla.org/en-US/questions/1119073 This no longer works in FF 69. As soon as I modify "HKEY_CLASSES_ROOT\FirefoxURL-F66A7FFE1BF331E2\shell\open\command", FF is detecting it and changes its status to "NOT your default browser". I'd appreciate your help.

Moambuepyre Yaron rupive

Ñemoĩporã poravopyre

@radar81,

Yes, I've found a solution.

Use:

[HKEY_CLASSES_ROOT\FirefoxHTML-F66A7FFE1BF441E2\shell\open\command] @="\"C:\\Program Files\\Mozilla Firefox New\\firefox.exe\" -private-window \"%1\""

[HKEY_CLASSES_ROOT\FirefoxURL-F66A7FFE1BF441E2\shell\open\command] @="\"C:\\Program Files\\Mozilla Firefox New\\firefox.exe\" -private-window \"%1\""

Replace the path and "-F66A7FFE1BF441E2" with your strings.

The status in FF preferences will change to "NOT your default browser" but *it will actually remain the default browser*.

Regards.

Emoñe’ẽ ko mbohavái ejeregua reheve 👍 1

Opaite Mbohovái (4)

radar81
radar81

I am also wanting to do set external links to launch in a private window by default. I also tried the same solution proposed by jscher2000 in https://support.mozilla.org/en-US/questions/1119073 and found that it no longer works. Were you able to find a solution? Thanks!

Yaron
Yaron Porandu apoha

Ñemoĩporã poravopyre

@radar81,

Yes, I've found a solution.

Use:

[HKEY_CLASSES_ROOT\FirefoxHTML-F66A7FFE1BF441E2\shell\open\command] @="\"C:\\Program Files\\Mozilla Firefox New\\firefox.exe\" -private-window \"%1\""

[HKEY_CLASSES_ROOT\FirefoxURL-F66A7FFE1BF441E2\shell\open\command] @="\"C:\\Program Files\\Mozilla Firefox New\\firefox.exe\" -private-window \"%1\""

Replace the path and "-F66A7FFE1BF441E2" with your strings.

The status in FF preferences will change to "NOT your default browser" but *it will actually remain the default browser*.

Regards.

Moambuepyre Yaron rupive

radar81
radar81

@Yaron It works, thanks so much!

Yaron
Yaron Porandu apoha

You're welcome.