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command line changed in version 67?

I have a number of scripts for Windows that I use to open multiple searches in multiple Firefox tabs. I don't use bookmarks because I have to preprocess the search argument to put it into the correct format for each of the individual search URLs.

Each line in the script launches Firefox from the command line with a different search URL. Up until now, each invocation opened a new tab in the currently active Firefox window.

All of a sudden it no longer works. The first Firefox invocation opens a tab in a new window. The new window has no title bar or bookmark toolbar (see attached image). The script then hangs until I kill the new window and then wait 10 seconds; then the next URL opens in another new window.

What changed? Is there any way for me to add tabs to an active Firefox window from the Windows command line?

I have a number of scripts for Windows that I use to open multiple searches in multiple Firefox tabs. I don't use bookmarks because I have to preprocess the search argument to put it into the correct format for each of the individual search URLs. Each line in the script launches Firefox from the command line with a different search URL. Up until now, each invocation opened a new tab in the currently active Firefox window. All of a sudden it no longer works. The first Firefox invocation opens a tab in a new window. The new window has no title bar or bookmark toolbar (see attached image). The script then hangs until I kill the new window and then wait 10 seconds; then the next URL opens in another new window. What changed? Is there any way for me to add tabs to an active Firefox window from the Windows command line?
Attached screenshots

தீர்வு தேர்ந்தெடுக்கப்பட்டது

Hi cbenenax, Firefox 67 has changed how external links open when you have multiple profiles. It seems Firefox will always use the default profile, even if you started Firefox and it currently is running in a different, non-default profile.

Could you take a look on the Profile Manager page:

Inside Firefox, type or paste about:profiles in the address bar and press Enter/Return to load it.

Firefox may list multiple profiles here, each with information about its folder locations (you can ignore that for the moment). The currently running profile should have:

This is the profile in use and it cannot be deleted.

If that profile has a button below its table to Set as default profile try clicking that button. If it doesn't have that button, hmm, I'll need to come up with Plan B.

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தீர்வு தேர்ந்தெடுக்கப்பட்டது

Hi cbenenax, Firefox 67 has changed how external links open when you have multiple profiles. It seems Firefox will always use the default profile, even if you started Firefox and it currently is running in a different, non-default profile.

Could you take a look on the Profile Manager page:

Inside Firefox, type or paste about:profiles in the address bar and press Enter/Return to load it.

Firefox may list multiple profiles here, each with information about its folder locations (you can ignore that for the moment). The currently running profile should have:

This is the profile in use and it cannot be deleted.

If that profile has a button below its table to Set as default profile try clicking that button. If it doesn't have that button, hmm, I'll need to come up with Plan B.

Doesn't have Set as default profile button. See image.

Oh, wait. The window that was open before I launched the script did not have the button, but the new window that opened did have it.

I pressed the button, closed the new window, and relaunched the script. It then worked as expected. Thanks.

Hi cbenenax, thank you for exploring that and reporting back.

We're still trying to get a better understanding of the step being missed during some updates so the developers can try to prevent the problem from occurring, but it's taking a while to fill in the picture.