When I click on certain links (e.g. the "Traffic Detours" link at the top of http://bigelow-baumblvd.otmapgh.org/) the target of the link is a PDF file set to open in a new tab. I have FF configured to prompt me as to what to do with files of this type (as I commonly wish to save them). However, the tab underneath is always advanced to the next tab before this dialog is presented, so (a) I lose any contextual information about what it is that I'm downloading, especially if the filename is unhelpful, and may be misled if I was choosing to download one PDF document from a set of several open tabs each describing a different PDF report or paper, and (b) Even if I choose cancel, I am returned to the tab AFTER the one I was viewing, which is not the expected behavior. The expected behavior is that if I am looking at a page like http://bigelow-baumblvd.otmapgh.org/ and click a link there, which produces a dialog, that dialog is visible on top of the http://bigelow-baumblvd.otmapgh.org/ page instead of whatever page happens to be loaded in the next tab. Firefox should only advance to the next tab if it's opened a tab and is displaying something there which is more relevant to the content I've requested than the page with the link I've just clicked on.
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