Hi miguel,
I cannot reproduce this - it works fine for me...
I open PWM by clicking on the status bar icon (not the toolbar icon).
I open an Account to its Settings window (where I can change the Account Settings for that account if desired).
I click on the main FireFox window behind the open PWM Account Settings windows (there are 2 - the main PWM window, and the Account Settings window for the Account I opened), and focus changes to the main FFox window.
I click on the PWM statusbar icon, and focue changes back to the Account Settings window both PWM windows come back to the top of FireFox Main window).
Works fine for me... maybe a conflict with another extension?
I'm using FFox 1.5, Windows XP Pro sp2, PWM 1.4.4b