I'm using Chromium from the quantal repositories and I get the same behaviour, so it's not a Firefox bug. If I disable the "Unity WebApps Chromium extension" form the extensions window, the bug disappears.
I'm using Chromium from the quantal repositories and I get the same behaviour, so it's not a Firefox bug. If I disable the "Unity WebApps Chromium extension" form the extensions window, the bug disappears.