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PDF's keep opening in Firefox, even though I set the Action to "Always ask" for application/pdf content type. why?

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Tools -> Options -> Applications

I have Action set to: Always Ask for content type: application/pdf

When I send a valid pdf with the http header: Content-type: application/pdf

I expect to be asked if I want to download the file or open it. The file opens in the browser without asking me.

Interestingly, if I send a corrupted pdf, I get the option.

In Adobe Reader X, I have changed: Edit -> Preferences -> Internet

so that all settings regarding the web browser are unchecked (including "Display PDF in browser").

Tools -> Options -> Applications I have Action set to: Always Ask for content type: application/pdf When I send a valid pdf with the http header: Content-type: application/pdf I expect to be asked if I want to download the file or open it. The file opens in the browser without asking me. Interestingly, if I send a corrupted pdf, I get the option. In Adobe Reader X, I have changed: Edit -> Preferences -> Internet so that all settings regarding the web browser are unchecked (including "Display PDF in browser").