When you click on a file Firefox determines if there is a plugin that can handle the file type or if there is a so called download action defined. Download actions are user defined actions that come into effect when the box "Do this automatically for files like this from now on" is checked in Firefox during a file download.
When you check the box in Firefox you tell the browser to perform the selected option from that point on until you change it again in the options. This can for instance be useful if you always want to download pdf documents or zip files to your local system and not have them displayed in the browser by default or opened automatically.
Configuring automatic options can lead to issues on the other hand, for instance when you want to modify which application should open a particular file type. You have two options on how to resolve this situation. You can press Alt if the menu bar is not shown and select Tools > Opens to the the Firefox options. You find the download actions under the Applications tab in the window that opens up.
Single download actions can be removed there. The other option would be to reset all Download Actions if things have been really messed up and you want to start over. The steps are the following:
Update 2: Please note that the listed preferences are no longer available in the Firefox browser, and that you cannot reset the actions this way anymore. You can however sort the preferences by user modification to see if there is anything that you can change.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.