http://llvm.org/devmtg/2013-11/slides/Rotem-Vectorization.pdf Diabling HWA fixes it. Tested on Win7 & Win8 machines with different graphics adapters (Direct3D 10 and DirectWrite capable).
Also reported upstream, see: https://github.com/mozilla/pdf.js/issues/4021.
Summary: PDF: missing text with hardware acceleration (Directon → [PDF Viewer] Missing text with hardware acceleration enabled
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:28.0) Gecko/20100101 Firefox/28.0 Reproduced on latest Aurora (20131216004006), setting as New.
Status: UNCONFIRMED → NEW
Ever confirmed: true
Priority: -- → P3
Status: NEW → RESOLVED
Last Resolved: 3 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 978276
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