> firefox.exe -no-remote -P profilename

exactly and separate profiles have their own add-ons.

I'm using this approach on a daily basis.

and via Extras > MozRepl > ChangePort menu the ports are changed on an indiviual basis.

update

to be able to change the port, have a look to the repl object passed to ->new in WWW::Mechanize::Firefox .

see:

repl - a premade MozRepl::RemoteObject instance or a connection string suitable for initializing one

Thank you all for your suggestions. I find that provided that I change the port of MozRepl of one of the FireFox windows and assign the new port to the instance of WWW::Mechanize::Firefox, my script can control the Firefox window. $mech = WWW::Mechanize::Firefox -> new ( launch => 'firefox', repl => "localhost:$instance_port" )

Is this a question? If yes, did you try?

For clarity:

Your use of the word "window" here is very confusing.

• One Firefox instance can easily have multiple connected windows (ctrl-n).
• As shown one Firefox installation can run different unconnected profiles.
• And finally you can run different Firefox installations at once.
Visually similar, but a big difference in automation!

Asking fuzzy questions can deter ppl from replying.

Cheers Rolf

_{(addicted to the Perl Programming Language and ☆☆☆☆ :)}