system
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Try PDF Xchange. It has all of the bells and whistles of the Adobe Reader but is a lot lighter and more secure. The default installation has a lot of things activated that you might want to turn off but that’s the only thing I’ve found wrong with it.
It’s very good and has browser plugins that work in all of the major browsers.
For addons (or extensions), I use AdBlock , Chrome YouTube Downloader, Search by Image, and Bookmarks Menu in Chrome.