Why does Chrome download my PHP files only in normal mode and not any other browser?

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It is possible that your Chrome browser is set to automatically download PHP files instead of displaying them. You can change this setting by going to Chrome settings, clicking on "Advanced", and under "Privacy and security" selecting "Content settings". Then, scroll down to "Automatic downloads" and turn off the switch for "Do not allow any site to download multiple files automatically".

Other browsers may have different default settings for handling PHP files, which is why they may behave differently.