open php web pages
 

I can't open web pages that I save in computer with the extension .php using firefox just with Konqueror. If the page have the extension html the's no problem but php dont't open. Why?

PHP is a server-side language and you should be accessing them through a server, not clicking them in a file browser.

But I can open php pages in windows with internet explorer by clicking

You still shouldn't be, it wouldn't be parsing the PHP code that way. In reality you should have a testing server, either a seperate machine or just install PHP and Apache or lighttpd or on Windows use IIS and access the files by pointing your web browser at 'localhost'.