--- a/gfx/gl/GLContext.cpp
+++ b/gfx/gl/GLContext.cpp
@@ -1303,16 +1303,21 @@ GLContext::ChooseGLFormats(ContextFormat
 
     GLsizei samples = aCF.samples;
 
     GLsizei maxSamples = 0;
     if (SupportsFramebufferMultisample())
         fGetIntegerv(LOCAL_GL_MAX_SAMPLES, (GLint*)&maxSamples);
     samples = NS_MIN(samples, maxSamples);
 
+    // bug 778765
+    if (WorkAroundDriverBugs() && samples == 1) {
+        samples = 0;
+    }
+
     formats.samples = samples;
     aCF.samples = samples;
 
 
     const int depth = aCF.depth;
     const int stencil = aCF.stencil;
     const bool useDepthStencil =
         !mIsGLES2 || IsExtensionSupported(OES_packed_depth_stencil);