To work around an issue related to a combination of website JS library and a browser extension, I find myself launching a second Firefox with a different profile every day the past week.
I've now determined that the option "Use the selected profile without asking at setup" in the "Firefox - Choose User Profile" (dialog shown when starting `firefox -ProfileManager`) should work differently.
There is one profile that is my default. Whenever I normally start Firefox, I want that to be the one that is automatically selected.
When I need another instance, I start Firefox with `firefox -ProfileManager --new-instance`, then select another profile. So, I select another profile (double click, or click and press the button). But "Use the selected profile without asking at setup" is still checked. So, next time I normally start Firefox, that other profile is used instead of my base profile.
Instead, the checkbox should somehow be linked to one profile. The checkbox could stay in this dialog. But, it should uncheck when a different profile is selected.
I do not want that profile to be the one to start whenever I close all instances and start Firefox normally.