I have two instances of two different profiles (lets call them profile A and profile B) of Firefox running simultaneously. When I click on a link in another application (for example a link in Thunderbird) the Firefox instance I started last will open up the link. This can be profile A or profile B, whichever I started later. However, I would like links to be open in the instance of profile A at all times. How can I do this without making sure profile A is started after profile B? Previously I could achieve this using the -no-remote command line option. This option has been removed from the latest Firefox version.