Link in screenshot: https://wikisource.org/w/index.php?title=Page:Amari_jatir_agua_neta.pdf/19&action=edit

Can't reproduce the problem with Firefox 32 on Fedora 20.

The problem still persists for FF31 and FF32 on Windows XP. The reason it displays correctly is because of the availability of system font which is not the case in XP. In short, webfont is not loading for the edit field and has to be fixed. And I do not understand why it is unprioritized. I am conducting a series of workshop for about 50 people and have been facing this problem. There might be many more facing the same problem. Please fix this.

Errrm, am I correct that the Oriya script is still entirely correctly displayed on your Windows XP system and is readable, just that the font looks less good?
If I am wrong, please explain the specific problem that you face from a *user* point of view who might not know about technical details like local fonts and webfonts. Thanks!

And what kind of workshop? When? Are all machines still running on ancient XP?

(In reply to Andre Klapper from comment #4)

And what kind of workshop? When? Are all machines still running on ancient
XP?

Asking two of your questions:
A) Font diplays correctly in the interface which means webfonts are getting loaded everywhere except the editing field.

B) Outreach workshop where faculty and students were digitizing books by retyping books available as PDF on Wikisource.

Am I correct that the Oriya script is still readable in the editing field, just that the font looks less good?

(In reply to Andre Klapper from comment #6)

Am I correct that the Oriya script is still readable in the editing field,
just that the font looks less good?

Well, the script is readable because of Arial that has Indic support but no rendering. Without rendering the conjuncts cannot be read. In the screenshot I attached before you can compare them.

It seems to me that the problem is not so much in the ULS extension as it is in the fact that this is the Multilingual Wikisource, where all content is marked as lang="en" - English. ULS applies webfonts only to elements with the appropriate lang attribute.

To resolve this issue for this site, there must be either an extension or a user JavaScript that applies the appropriate lang attribute to #mw-content-text.

The Oriya Wikisource is open, so the particular issue is not relevant any more.

The more general fix would be to implement per-page language.