Ubuntu 15.04 (vivid) reached end-of-life on February 4, 2016
User no longer uses Launchpad and implied issue not Firefox specific
Closing as report unconfirmed and no further comments for over 3 years
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Please disregard comment #2
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https://bugs.launchpad.net/bugs/1506969
Title:
Window dimming effect stays after window has gone
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