I am developing a cross browser plugin for document viewing (.pdf, .doc, .xls, .mht, .tiff, .dwg). It needs to be a plugin and not the extension. Whatever i try to search takes me to the links for extensions and not for plugins. I found NPAPI as cross platform plugin architecture but soon found out that major browsers have planned to depreciate and stop the development support, Chrome is one of them. I have been searching from last 3 days and finding myself in no man's land.
I intend to develop the tool as a business requirement and not use some already developed software tools like quickview. Please provide some good links to the cross browser plugin development. A little help will mean a lot. Thank you