Switching between open pdfs in Preview without losing your place

Auto-opening a downloaded file from a browser is done on pretty much a browser-to-browser basis. Since you asked about Chrome, here's the relevant blurb from Google's Docs:

Automatically open certain types of files

If you want certain types of files to always open after they're done downloading, click the arrow next to the file button in the downloads bar and select Always open files of this type. To prevent potentially malicious files from automatically downloading to your computer, this option isn't available for executable filetypes, such as those with .exe, .dll, or .bat extensions (for Windows), and .dmg extensions (for Mac).

Personally, these features weren't visible when I tried it, but then I hardly use Chrome other than for the odd web site test.

If the option to switch to a space with open windows for an application is checked in the Mission Control preferences and the application has no other windows, you can just select it from the application switcher or Spotlight.

Control-left, control-right, and control-numbers should change spaces by default; the shortcuts can be changed in the keyboard preferences.

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