I still cannot understand why FF has to show PDF inside browser by default. I always get a customized version of Firefox. It has the PDF thingy disabled (in the installer) by adding // before the pref("plugin.scan.Acrobat", "5.0"); in the all.js file and a modified prefs.js (I am aware of the "PDF Download" extension but I like the other options with this version). It also includes some extensions by default (ConQuery, Extended Link Properties, Flashblock, Google Send to Phone, Coralize, All-in-One Gestures, MR Tech Local Install, Dict, Add Bookmark Here, and Zotero) additional "searchplugins", a custom "prefs.js", "hostperm.1", and "localstore.rdf".