Bug 979536 - Part 1: Look for leftover fronts after toolbox close. r=ochameau
Bug 979536 - Part 2: Fix reopening timeline tool. r=vporof
Bug 979536 - Part 3: Fix reopening storage tool. r=mratcliffe
Bug 979536 - Part 4: Fix reopening web audio tool. r=jsantell
Bug 979536 - Part 5: Fix reopening graphics tools. r=vporof