Bug 887466 - Rearrange SyncDecode so that we never try to finish a size decode with the decode lock held. r=seth a=lsblakk

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extra : transplant_source : %DD%BDp%F5%0Dssm%5B%FAXE%60%0A%F8l%29%01q%A2
extra : histedit_source : b8dcd15565173a335e907f82e45d78913705c22c
Bug 895939 - Click-to-activate plugin notification is ugly, r=jaws a=bbajaj