Bug 1690661 will solve this problem when user is disable RDD/GPU video decoder, means the infobar for WMF not found would displayed correctly. However, we still need to do some work in this bug in order to propagate the error from RDD/GPU process.
Bug 1690161 Comment 3 Edit History
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Bug 1690661 will solve this problem, which means the infobar for WMF not found would displayed correctly. However, this works because we still load WMF decoder module in the content process, the error flag would be set. If we remove the WMF usage in the content process, then RDD/GPU won't propagate the error flag back in the content process, then we will not be able to show the infobars. Therefore, we need to implement a mechanism to propagate the error from RDD/GPU processes.