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Bug 2064564 Comment 0 Edit History
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Uploading a custom wallpaper leaves the previous file in <profile>/wallpaper/ forever, un-referenced and unreachable and nothing in Firefox ever removes it. This deletes the replaced file when a new one takes its place and sweeps leftovers on startup so profiles that already accumulated them get cleaned up. It also writes the identifier pref only after the file lands and clears it when the file it names is gone.