I see this error repeated many times in the Nightly error console: NS_ERROR_FAILURE: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE)[nsITaskbarTabPreview.invalidate]1 WindowsPreviewPerTab.jsm:401:0 I suspect it's caused by bug 526620

Looks like a fairly passive failure we can catch and ignore: http://mxr.mozilla.org/mozilla-central/source/widget/windows/TaskbarPreview.cpp#185

I see this when the taskbar is set to autohide. Something like this? I initially thought that if !mVisible, we should still invalidate the preview, but it appears that mVisible isn't tracking whether the taskbar itself is *currently* visible, so it seems OK.

There are two calls in WindowsPreviewPerTab.jsm to this, one checks preview.visible first before making the call, the other doesn't. I don't think either should need to check visible first, we should remove that check as well.

Patch with requested change to WindowsPreviewPerTab.jsm, carrying r+ forward. Try at https://treeherder.mozilla.org/#/jobs?repo=try&revision=a1259f724f0b and I'll land when it looks green.

Hi Mark, can you provide a point value.

Seems like a low impact issue, so not setting it for verification.

Mistakenly filed against Firefox 38 and should be instead 38 Branch. Sorry for the spam. dkl

I'm on Firefox 38.0.5b1 x64 NS_ERROR_FAILURE: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIInterfaceRequestor.getInterface] network-monitor.js:82:0 NS_ERROR_FAILURE: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsITaskbarTabPreview.invalidate] WindowsPreviewPerTab.jsm:406:0 I'm getting alot freezes and some time freeze forever and I need kill firefox process. screen of my console http://puu.sh/hK0IL/15d690b775.png

(In reply to Gabriel from comment #10) > I'm getting alot freezes and some time freeze forever and I need kill > firefox process. > > screen of my console http://puu.sh/hK0IL/15d690b775.png I notice "lastpass" in the console, so assuming you are using Nightly, lastpass is almost certainly the problem - for me it makes Nightly unusable. Try disabling it and see if your problems stop. Bug 1008768 is tracking this (even though the title of that bug isn't quite up-to-date)

Hello, I just found this bug number when I found the commit that will hopefully fix this issue. Is this targeted for 39? It would be nice to have it fixed also for 38 or 38.0.5. Could someone please mark https://bugzilla.mozilla.org/show_bug.cgi?id=1151863 and https://bugzilla.mozilla.org/show_bug.cgi?id=1162155 as duplicates of this?

(In reply to Ricardo from comment #12) > Is this targeted for 39? It would be nice to have it fixed also for 38 or > 38.0.5. That's right, this fix will be in Firefox 39. Firefox 38.0.5 was already released today as far as I know