Please see the attachments and descriptions regarding the fontconfig priority adjustment. As you can see, regardless of the fontconfig adjustment and the MOZ_ENABLE_PANGO=1 variable, I do not get correct rendering of Telugu text in firefox, but gedit & thunderbird are able to render all three languages correctly.
One interesting thing is that Hindi text is always rendered correctly in firefox. I think there is something wrong with the configuration of ttf-{telugu,kannada}-fonts packages with respect to firefox, or vice versa.
Also, for the screenshots, I made a brand new profile for Firefox to ensure that my settings don't influence the result. And sorry for posting the last attachment twice; my internet connection broke while uploading so I re-uploaded it.
Please see the attachments and descriptions regarding the fontconfig priority adjustment. As you can see, regardless of the fontconfig adjustment and the MOZ_ENABLE_PANGO=1 variable, I do not get correct rendering of Telugu text in firefox, but gedit & thunderbird are able to render all three languages correctly.
One interesting thing is that Hindi text is always rendered correctly in firefox. I think there is something wrong with the configuration of ttf-{telugu, kannada} -fonts packages with respect to firefox, or vice versa.
Also, for the screenshots, I made a brand new profile for Firefox to ensure that my settings don't influence the result. And sorry for posting the last attachment twice; my internet connection broke while uploading so I re-uploaded it.