When you open the first Firefox window. how are you doing it? From a shortcut?

I get the same when I use a shortcut that has the -no-remote flag.

yeah. i have it set it in the target line on the shortcut properties.

i use this because of having multiple versions of Firefox installed. Firefox 52.0ESR is installed, because it still supports Java. which i use online Java apps from time-to-time.

the information for this parameter states, "That means that such instances won't be re-used. " although, it is the only bit i understand from > https://developer.mozilla.org/en-US/docs/Mozilla/Command_Line_Options#-no-remote

however, this hasn't been an issue in the past. it only became an issue after the most recent Firefox update. without using that parameter, i can have launched only one version at any given time.

i don't entirely understand the option, and just know it lets me have open two different versions of the Firefox browser. if removing the option from one shortcut or the other, then nothing works as expected. as expected, i should be able to have both browser versions launched at the same time and/or can launch both versions in any order.

That is what I had thought. I called for more help.

alrighty.

for now i will just use the move tab work-a-round.

You start Firefox with the -no-remote command line switch.

• https://developer.mozilla.org/en-US/Mozilla/Multiple_Firefox_Profiles

If this is the case then you won't be able to send data to this instance. You should at least start one Firefox instance without this switch to be able to send links to it. Otherwise you need to drop the link in this Firefox instance (possibly on the new tab + button).