[Bug 1971608] [NEW] Firefox PDF font rendering is often messed up

[Rahul]

Public bug reported:

I don't know whether it is an ubuntu bug or a firefox bug but since I am
running the mozilla-supported ubuntu snap of firefox 99.0.1 (on 22.04
jammy) (firefox 100 not yet available on snap), posting it here.

Many pdfs have messed-up fonts on this firefox. Following a reddit
thread, I tried disabling browser.display.use_document_fonts in
about:config. Then the pdfs render correctly, but html webpages have
messed-up fonts.

Reddit post with screenshots and sample URL here; previous reddit thread linked therein. 
https://www.reddit.com/r/firefox/comments/uhz6d1/continued_messedup_font_rendering_in_firefox_pdf/

Others (on this and previous thread) report it doesn't happen on other
platforms. On this thread, someone confirms it on a Ubuntu VM, and
someone else says it doesn't happen on Mint (based on Ubuntu but I think
doesn't use snaps).

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Firefox PDF font rendering is often messed up

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