9888b92f-1380-4f28-9b15-5161c0181210

That is a shutdown hang where Firefox takes too long to close and a crash is forced.

• Firefox 63.0.3 Crash Report [@ IPCError-browser | ShutDownKill ]

Use one of these to close Firefox if you are currently doing that by clicking the close X on the Firefox title bar.

• "3-bar" menu button -> Exit (Power button)
• Windows: File -> Exit
• Mac: Firefox -> Quit Firefox
• Linux: File -> Quit

If you use "Clear history when Firefox closes" the try to disable this feature.

bp-9888b92f-1380-4f28-9b15-5161c0181210 Signature: IPCError-browser | ShutDownKill +++++++++++++++++++++++++++++++++++++ bp-9888b92f-1380-4f28-9b15-5161c0181210 Signature: IPCError-browser | ShutDownKill

A shutdown kill means that something in Firefox is not closing properlly.

Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?