What kinda links are those?

The kinds that you click on outside of Firefox that your operating system funnels to Firefox. See e.g. the option browser.link.open_newwindow.override.external in about:config.

That option gets close to what I want. On https://support.mozilla.org/en-US/questions/1109391 , a user lists the possibilities for that option. None of them can be used to force Firefox to use a specific window, however.

I believe I would need a per-window setting, anyway. Or some way to mark a window as "special", like Chrome's `--app` option.

Hi

I might be able to help with this.

Just to clarify, you want to click on an external link and it opens a new instance of Firefox, but not to open a tab in the existing open Firefox instance?

I think my question is sort of pointless. All I really want is a application version of <chat app used at work>. If Firefox had a "--app" option like Chrome, that might do what I want.

I suggest this question merely be closed.

Hi Chreekat

No problem, I will lock this thread but if you have another support question with Firefox, please feel free to ask a new question and we will do our best to help.