You can know the comparison between Chrome and Firefox native PDF Readers from below link.
Installing PDF.js PDF Viewer in Opera Next 15
1. Install the extension.
2. From then onwards, PDF files in Opera 15 will be loaded inline in browser directly using PDF.js.
Installing Mozilla’s PDF.js for Google Chrome
With a simple trick, we can now install the same Opera extension in Google Chrome also.
First, download PDF Viewer extension for Opera – right clicking on ‘Add to Opera button and selecting “Save linked content as” will do- make sure Windows to show file extensions by unchecking “hide extensions for known file types” in Folder Option dialog and now rename ‘nex’ extension in ’pdf-viewer-0.8.169-1.nex’ to ‘crx’.
Now drag and drop this extension onto Chrome://extensions page.
Update: As Alex said in the comment, PDF Viewer based on PDF.js is already available on Chrome web store, so the above process no longer necessary.
Here is the link for it: https://chrome.google.com/webstore/detail/pdf-viewer/oemmndcbldboiebfnladdacbdfmadadm
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