--- firefox-52.9.0esr.orig/gfx/thebes/gfxFont.cpp       2020-06-03 21:55:12.303261510 +0300
+++ firefox-52.9.0esr/gfx/thebes/gfxFont.cpp    2020-06-03 21:57:35.318890953 +0300
@@ -3071,6 +3071,28 @@
 
     return true;
 }
+// Explicit instantiations of GetShapedWord, to avoid libxul link failure
+template gfxShapedWord*
+gfxFont::GetShapedWord(DrawTarget *aDrawTarget,
+                       const uint8_t *aText,
+                       uint32_t aLength,
+                       uint32_t aHash,
+                       Script aRunScript,
+                       bool aVertical,
+                       int32_t aAppUnitsPerDevUnit,
+                       uint32_t aFlags,
+                       gfxTextPerfMetrics *aTextPerf);
+
+template gfxShapedWord*
+gfxFont::GetShapedWord(DrawTarget *aDrawTarget,
+                       const char16_t *aText,
+                       uint32_t aLength,
+                       uint32_t aHash,
+                       Script aRunScript,
+                       bool aVertical,
+                       int32_t aAppUnitsPerDevUnit,
+                       uint32_t aFlags,
+                       gfxTextPerfMetrics *aTextPerf);
 
 // Explicit instantiations of SplitAndInitTextRun, to avoid libxul link failure
 template bool
--- firefox-52.9.0esr.orig/gfx/thebes/gfxFont.h 2020-06-03 21:55:12.299928120 +0300
+++ firefox-52.9.0esr/gfx/thebes/gfxFont.h      2020-06-03 21:58:04.522669252 +0300
@@ -2171,6 +2171,72 @@
     static double CalcXScale(DrawTarget* aDrawTarget);
 };
 
+// Explicit declarations of SplitAndInitTextRun, to avoid libxul link failure
+extern template bool
+gfxFont::SplitAndInitTextRun(DrawTarget *aDrawTarget,
+                             gfxTextRun *aTextRun,
+                             const uint8_t *aString,
+                             uint32_t aRunStart,
+                             uint32_t aRunLength,
+                             Script aRunScript,
+                             bool aVertical);
+
+extern template bool
+gfxFont::SplitAndInitTextRun(DrawTarget *aDrawTarget,
+                             gfxTextRun *aTextRun,
+                             const char16_t *aString,
+                             uint32_t aRunStart,
+                             uint32_t aRunLength,
+                             Script aRunScript,
+                             bool aVertical);
+
+// Explicit declarations of GetShapedWord, to avoid libxul link failure
+extern template gfxShapedWord*
+gfxFont::GetShapedWord(DrawTarget *aDrawTarget,
+                       const uint8_t *aText,
+                       uint32_t aLength,
+                       uint32_t aHash,
+                       Script aRunScript,
+                       bool aVertical,
+                       int32_t aAppUnitsPerDevUnit,
+                       uint32_t aFlags,
+                       gfxTextPerfMetrics *aTextPerf);
+
+extern template gfxShapedWord*
+gfxFont::GetShapedWord(DrawTarget *aDrawTarget,
+                       const char16_t *aText,
+                       uint32_t aLength,
+                       uint32_t aHash,
+                       Script aRunScript,
+                       bool aVertical,
+                       int32_t aAppUnitsPerDevUnit,
+                       uint32_t aFlags,
+                       gfxTextPerfMetrics *aTextPerf);
+
+// Explicit declarations of InitFakeSmallCapsRun, to avoid libxul link failure
+template<> bool
+gfxFont::InitFakeSmallCapsRun(DrawTarget *aDrawTarget,
+                              gfxTextRun *aTextRun,
+                              const uint8_t *aText,
+                              uint32_t    aOffset,
+                              uint32_t    aLength,
+                              uint8_t     aMatchType,
+                              uint16_t    aOrientation,
+                              Script      aScript,
+                              bool        aSyntheticLower,
+                              bool        aSyntheticUpper);
+template<> bool
+gfxFont::InitFakeSmallCapsRun(DrawTarget *aDrawTarget,
+                              gfxTextRun *aTextRun,
+                              const char16_t *aText,
+                              uint32_t    aOffset,
+                              uint32_t    aLength,
+                              uint8_t     aMatchType,
+                              uint16_t    aOrientation,
+                              Script      aScript,
+                              bool        aSyntheticLower,
+                              bool        aSyntheticUpper);
+
 // proportion of ascent used for x-height, if unable to read value from font
 #define DEFAULT_XHEIGHT_FACTOR 0.56f