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Why is Firefox mobile's PDF view so bad, while Desktop's is perfectly fine? (slrpnk.net)

submitted 6 months ago* (last edited 6 months ago) by [email protected] to c/[email protected]

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On Mobile (using Mull) the PDFs are completely pixelated and simply dont render more details. Even after zooming in it takes forever.

Meanwhile on Desktop (Librewolf, Firefox, ... on Fedora) it seems a bit slow compared to Okular, but it is very fine.

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[–] [email protected] 9 points 5 months ago

And PDF on mobile is so slow....

[–] [email protected] 5 points 5 months ago (1 children)

https://github.com/Divested-Mobile/Mull-Fenix/issues/178#issuecomment-1783829180

[–] [email protected] 1 points 5 months ago* (last edited 5 months ago) (1 children)

Good hint!

In about:config:

javascript.options.baselinejit true

Still the same, my used PDF

It is likely really the issue that it doesnt render until the whole document is downloaded. This needs to change or at least have a setting.

So I turned JIT off again.

[–] [email protected] 1 points 5 months ago (1 children)

I just tried opening the link in Mull and it is amazingly fast. It takes only 1 sec to render after zooming in or scrolling a lot at once. I'm a bit surprised because the file is 300+ pages. But I do encounter slow PDF loading sometimes, then I download the file and open it in another app

[–] [email protected] 1 points 5 months ago* (last edited 5 months ago) (1 children)

Strange...

I have NoScript and UBlockOrigin installed, disabling both didnt change anything.

Disabling both and enabling JIT didnt change anything. Maybe it is a GrapheneOS issue?

[–] [email protected] 1 points 5 months ago

I dont know, I have ublock, but not using the rest

[–] [email protected] 3 points 5 months ago (1 children)

I use the Android PDF.js extension and PDFs work great for me.

[–] [email protected] 2 points 5 months ago (1 children)

for some reason i'm not able to download it, is there aything im supposed to do other than click the unclickable download button?

[–] [email protected] 1 points 5 months ago (1 children)

Does the webpage say anything about the extension being unavailable or something? I don't know if stable Firefox has that one enabled. I use Nightly which had allowed all extensions for a long time and idk about Stable

[–] [email protected] 1 points 5 months ago

could be that, but all i see is the page with the big blue download button (which is slightly grayed out and not working) so idk. anyway, i found in this posts thread a good pdf reader so i wont need the browser extension, thanks though

[–] [email protected] 3 points 5 months ago (1 children)

I use MJ PDF on Android, and it's very responsive, and foss: https://github.com/mudlej/mj_pdf/

[–] [email protected] 2 points 5 months ago* (last edited 5 months ago) (1 children)

Yes same but that just uses the Chromium Webview. It is the best viewer but not for stuff you dont download.

https://mupdf.com/ is another one if you want somethinf standalone.

[–] [email protected] 1 points 5 months ago (1 children)

muPDF viewer is great. It only shows the contents of the PDF file and nothing else.

[–] [email protected] 2 points 5 months ago

Just tried it, works very well and fast but I think I prefer MJ PDF also because it runs on hardened Chromium so less RAM etc.

Also MJ PDF has a dark mode, inverting black/white on texts