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The built-in chrome PDF viewer PPAPI plugin is generally pretty decent and is at least sandboxed on most platforms. It handles larger documents a bit better than PDF.js.

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Is it proprietary? If not, can one use it in Chromium?

https://opensource.google/projects/pdfium

Seems to be derived from Foxit.

It's not proprietary, 3-clause BSD licensed. It's part of the chromium project. I use it on OpenBSD.

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