Why you should not install separate application for reading and editing PDF files
One option is to go for alternative, free and light software like Foxit Reader and SumatraPDF. Go for them only if you are very serious PDF user and you need dedicated software for the same.
The best software for opening PDF files are your browser itself. Latest versions of Google Chrome and Mozilla Firefox already supports opening PDF files without installing any extensions or plugins. This is applicable for their mobile versions too. So, you don't need any additional software to open PDF files if you already have Google Chrome or Firefox.
But only half of the problem is solved now. What if you want to edit/create PDF files?
PDFescape is an online tool for creating and editing PDF files right from your browser. There is no need of registration and it is perfectly fit for basic needs.
URL: http://www.pdfescape.com/