Here's a problem I regularly encounter: I view a .pdf file in Firefox and after some reading I decide that I want to download it. I click the download button and the save dialogue opens. The default name for the file will frequently be some random string (vdefjh42hk.pdf), or some very generic description (article.pdf). I want to change the file name to the actual title of the .pdf. However, I can neither interact with the pdf viewing screen without closing the save screen, nor move the save screen independently of the pdf viewing screen. This means that I can neither copy-paste the title from the .pdf into the save dialogue, nor move the save dialogue to a place that allows me to see the title and type it. So I resort to downloading the .pdf with the default name, then opening the Downloads folder an renaming it there.
Proposed solution: