User Agent: Steps to reproduce: 1. Open a terminal, echo $DISPLAY (assuming ":0.0"). 2. Open a terminal, su to a second user ("u2"): su - u2 3. As user u2: Start either Firefox 3.6.28 (/usr/bin/firefox is assumed to be 3.6.28, plain "firefox" is assumed to start /usr/bin/firefox) or nightly 2012-03-27-03-11-49-mozilla-central. 4. As the initial user open a terminal and issue env -i DISPLAY=:0.0 firefox http://www.mozilla.org Actual results: 4. A new tab is created in the user u2's browser. Expected results: 4. A different user's browser shall not be affected.
It's bug 295945, bug 271191 and similar. May be fully by design. To prevent this from happening, use "-no-remote" in the command line (of at least the first instance), or set a shell variable MOZ_NO_REMOTE=1.
Component: Untriaged → Startup and Profile System
Product: Firefox → Toolkit
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