Same happens here. Intel Mac 10.6.4

Same here, I guess this is because FF4 is 64bits and Flash Player is not, hope they'll find a workaround for beta 2.

count++; //same problem here

Same problem. Everything's ok until I open a site with flash content, then then second ff icon appears in the dock. OSX 10.6.4

same same.

It started happening after installing Flash 10.1.

Same here.. please fix soon!

same here :-/

You probably see the plugin-container process.

http://kb.mozillazine.org/Plugin-container_and_out-of-process_plugins https://wiki.mozilla.org/Firefox/Crash_Protection

Same here.

10.6.4

FF 4.b1

Same

Try this...I fixed it on my win 7 machine. Open firefox with the button on your taskbar. Now, after there are two icons, right click on the original one you clicked on and unpin it from the task bar. Now close the other instance. You should have NO icons for firefox left on the taskbar. Next, click the start button and enter firefox in the search box (where macs is I'm not sure) only DON"T hit enter. Right click on the firefox found by the search and select "Pin to task bar". This fixed the issue for me. Now I only have one instance of the icon on the taskbar when I launch it.