Thomas, probably it is possible to build FF and TB with the system's libcairo. I do not know why the maintainers of these packages stick to stone-old libraries which have many bugs which are already fixed in the current version.
But I will not do this fix as I am not the maintainer of FF and TB. The bug is also assigned to these packages so the actual maintainers will see this discussion and hopefully apply the fix. You can help them by attaching patches/debdiffs.
So as we know the solution now and that it is in FF and TB and not in cups and cups-filters, I am closing the appropriate tasks.
Thomas, probably it is possible to build FF and TB with the system's libcairo. I do not know why the maintainers of these packages stick to stone-old libraries which have many bugs which are already fixed in the current version.
But I will not do this fix as I am not the maintainer of FF and TB. The bug is also assigned to these packages so the actual maintainers will see this discussion and hopefully apply the fix. You can help them by attaching patches/debdiffs.
So as we know the solution now and that it is in FF and TB and not in cups and cups-filters, I am closing the appropriate tasks.
Thank you very much for investigating this.