How does mobile Firefox still have no integrated PDF viewer but instead make you download and shell out to a dedicated PDF app (requiring you to find one you trust and waste storage space each time you view a PDF)?!
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GrapheneOS has a security-focused PDF viewer based on using pdf.js in the WebView. Can use it elsewhere:
* play.google.com/store/apps/det
* github.com/GrapheneOS/Pdf
Apps can directly open a PDF with it without saving it as a download but browsers may not commonly have support for that.
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It's currently very barebones but we plan on improving it quite a lot in the near future. Our focus was making a privacy/security focused Camera app but now that app is quite mature and we plan on shifting focus over to making the PDF viewer into a modern app with more features.
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Thanks! I just installed it. It works much better than the one that came with my Pixel 4.
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I tried here but the zoom ux is broken. It scales around origin instead of pinch center.
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There's pending work on less terrible zoom gestures, page swiping gestures, encrypted PDFs, printing, search and other things. These things were mostly done but there were issues that blocked merging them.
We have a full-time app developer who will be switching focus to it soon.