Many dialog box cannot be shown in my Firefox. including * when File > Open File (including using shortcut Ctrl+O), * when File > Save page as (including using shortcut Ctrl+S), * when File > Print (including using shortcut Ctrl+P), * when open page, clicking link, or even a javascript to download a file, * when I want upload a file to the web, by clicking Browse button in <input type="file">, * when I want to change default download loacation in Option > General tab, * and many many more... When I do that nothing happens at all, ''even in Save Mode''! I alread try: * Delete localstore.rdf * Create a new profile * '''Run Firefox in Save Mode''' * Unistall and re-install Firefox * Disable and delete all of my add-ons * Reset print.* in about:config * Cleaning my registry * Try Firefox 5 and 6 And none of them works! Please help...! I'm really frustated! I only can use my Firefox to surf the internet now, but no uploading, no downloading, no saving page, no printing. Really, really disapointed. Note: * I can save and print a pdf which opened in Firefox, only if i use menu in the plugin's which inside the tab page (beside Adobe Connect icon), but not working if I use menu bar in Firefox. * Other browsers like Chrome, IE, Opera works fine. System: Windows XP, Firefox 5.0 This happened: Nearly Every time Firefox opened This started when: I install Firefox 5, and HP D2666 printer