The New Window Disabler […] Features Include: – remove _blank targets – make links with rel=external– remove javascript popups (needs work)
It’s a Greasemonkey script.
Looks like I’d had this, or _blank Must Die, or Don’t open new windows, installed for so long I’d forgotten about it, but definitely realized it was missing when those annoying pop-ups re-appeared after a clean install of Firefox.
Hum. I seem to have none of those scripts in my old installation’s profile folder. Wonder how I got rid of those pop-ups before?
Update: Ah: browser.link.open_newwindow.restriction set to 0. Ergo: forget everything I said above.