Like the title says, I'm looking for a way (whether by command-line argument, option, or plugin) which will allow me to force firefox to open all tabs in the same tab, but only for that specific window.
For example, I have Firefox open with GMail. When I open a new window (however it happens), I go to google.com. When I then open a new tab and go to wikipedia.org, I want wikipedia to open in the google tab. There is way to do this in about:config, but it seems to be browser-wide in all windows.
Ideally I'd like a command-line argument which will open a new window and have only that window open all tabs in the same tab. I'm not sure if this is even possible, but any help would be appreciated.