How do I change opening settings?

Somehow my settings got changed so that now, instead of opening a pdf page from a weblink, I have no choice but to save it as a hard copy on my desktop (or in a folder), THEN open it from my computer.  I never had to do this before & I want to change this setting back to "open" only, not save.  I have searched & tried everything I can find but nothing has worked yet.  HELP!

Firefox (since version 20) has it's own PDF viewer built in. Personally I don't like it, because it's incompatible with a great many PDFs that are online. That said, here's how to "disable" Firefox's PDF Viewer and use Reader:
In Firefox make sure you have at least two (2) tabs open - (Ctrl+T opens a new tab)
In the address bar of one tab, type "about:config" - minus the quotes, of course
You'll see a warning. Click "I'll be careful, I promise" and continue to the configuration page.
There's a search bar at the top. Type "js" - again, minus the quotes.
In the results you'll see pdfjsviewer.disabled with a vaule of false. Click it once, then right click it and choose Toggle to make the value "True".
Close that tab.
Click Tools>Options and go to the Applications tab
Locate Adobe Acrobat Document (or Portable Document File (PDF)) in the list and click the drop-down to select "Use Adobe Reader (in Firefox)". (Mine doesn't have that because I also have Acrobat Pro installed)
Click OK.
Click Tools>Addons to see that the Acrobat plugin is installed
Close and restart Firefox. PDFs should now open in a browser window with the Reader plugin.

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