Addon for "Firefox for Android".
Provides a way to view PDF files directly in the browser without cluttering up your "Downloads" directory. It uses Mozilla PDF.js to directly view PDF files. This is the same PDF viewer that is already built into the "Desktop Firefox" browser.
Main repository: https://github.com/M-Reimer/android-pdf-js.
AMO: https://addons.mozilla.org/en-US/android/addon/android-pdf-js/
Hacking: Do a temporary install.
Debugging on "Desktop Firefox" works, but you have to set pdfjs.disabled to true in about:config.
Building: make