Created attachment 535953 [details] [diff] [review]
As visible in content/base/public/nsIDocument.h, mShellIsHidden has been removed from it:
1.31 - // True if we're currently bfcached. This is only here for binary compat.
1.32 - // Remove once the gecko 2.0 has branched and just use mSHEntry instead.
1.33 - PRPackedBool mShellIsHidden;