Hi Mase,

I think this might be a server issue, can you try accessing the pages in another browser and tell us what happens? Also can you include examples to sites this happens to, are they ones that you made/host? I've had this issue before too, if your describing what I think.

Ben

Here's an example of what I am seeing. It happens randomly at different web sites and it has also happened with other types of files besides .php files.

That can also be caused by ad-blocking software that has removed GET data (?xxx=xxx) appended to the link to retrieve content from an ad server. With that GET removed there is nothing that the server can send and you get the php file.

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.com/kb/Safe+Mode

There is also security software (firewall) that can remove such GET data.