Mobile/Projects/PDF.js support

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Goals

Add PDF.js support to Firefox for Android so users do not have to rely on third party apps to retrieve, view, and interact with PDF documents obtained from the Web.

User stories

Note: Initial draft only - to be reviewed with UX since they've been thinking about how this needs to change for mobile more than I have

• As a user, I want Firefox for Android to download and display any PDF documents I open while on the Web so I do not have to use a third-party app.
• As a user, I want to be able to save a PDF document that is open in Firefox, so I can view them again later, even if I am offline.
• As a user, I want to be able to share a PDF document that is open in Firefox using the standard Android sharing system.
• As a user, I want to be able to print a PDF document that is open in Firefox via an existing printer that I have previously set up to work with my device.
• As a user, I want to be able to zoom/unzoom pages and images in a PDF document that is open in Firefox, so I'm better able to see the image content.
• As a user, I want panning and scrolling in a PDF document that is open in Firefox to be smooth so it's easier for my eye to track my current location while moving the page around.
• As a user, I want to be able to send a PDF document that is open in Firefox to another app on my device, in case Firefox doesn't seem to be displaying it properly.
• As a user, I want the option of "paging down" and "paging up" within a PDF document that is open in Firefox, but I want the "pages" to be displayed screens, not the actual pages in the PDF document.
• As a user, I want the option of using my volume up/down button for "paging up" and "paging down" within a PDF document that is open in Firefox for Android, so I don't have to use the touchscreen and end up blocking content with my finger.
• As a user, I want a way to quickly change the zoom level for a PDF document in Firefox, including:
  • Automatic zoom
  • Actual size (??)
  • Page fit
  • Page width
  • 50%
  • 75%
  • 100%
  • 125%
  • 150%
  • 200%
• As a user, I want to be able to quickly see what page I'm on in a PDF document open in Firefox.
• As a user, I want the option of showing a list of thumbnails of pages or a text-based list of pages for the PDF document open in Firefox, and I want to be able to use that list to navigate quickly between parts of the document. I want this list to be smart and able to auto-hide itself if I'm in portrait mode, but have the option of pinning it open if I'm in landscape mode.
• As a user, I expect my back button and tab closing to work as normal when displaying a PDF document in Firefox.
• As a user, I would like the option of displaying PDF documents in Firefox in "night mode" (light text on a dark background).
• As a user, I would like the option of having the display of PDF documents in Firefox automatically switch between "day mode" and "night mode" based on the ambient light in the room/space I am in (like our readability mode).
• As a user, I would like tap-to-zoom to also work on PDF documents displayed in Firefox, so I can just use my known Firefox behaviours to tap-to-zoom PDF documents in my browser.
• As a user, I expect "find in page" to work as normal in PDF documents displayed in Firefox, so I can just use my known Firefox behaviours to search PDF documents in my browser.

• Possible?: As a user, I want the option of having text reflow to fit the view screen when zooming/unzooming so I don't have to pan across and back to see full lines.

UX design

TBD

Quality criteria

TBD