I think it probably make sense to jump to renaming the settings file that associates particular content types with particular handlers. Firefox should then revert to its default behavior for PHP files.

See "Reset download actions for all file types" here:

https://support.mozilla.org/en-US/kb/cant-download-or-save-files#w_reset-download-actions-for-all-file-types

Does that help?

Note: "Open Containing Folder" has been changed to "Show Folder" in Firefox 14. (I think you meant Firefox, not funnelcake.) (Edit: Oh, I see about funnelcake: https://support.mozilla.org/en-US/que.../931860)

renamed the file, but it didn't have any effect.

Could anything be modifying the normal content-type header sent by web servers with php pages (i.e., text/html)? Recently installed/updated add-on, such as a downloader or proxy?

Did you try to clear the cache?

Are you running any web server software that may take over .php files?

Is there a MIME type or action set to the .php file extension in the registry?

• HKEY_CLASSES_ROOT\.php
• HKEY_CLASSES_ROOT\MIME\Database\Content Type

Cleared the cache, cookies and everything to scratch.

No web server running.

No MIME type or actions set in the registry.

Create a new profile as a test to check if your current profile is causing the problems.

See "Basic Troubleshooting: Make a new profile":

• https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile

There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.

If the new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.

See:

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox