99b78c18-d7cf-4b35-8c4c-ab3029e70760 10/20/2017 11:24 AM 725e82c3-098c-41f6-afd1-eb29e0ffb9c7 9/29/2017 12:59 PM b74dc557-da6b-4b37-83b3-60c23975dafc 9/27/2016 12:35 PM 681b9fd1-bf58-4438-ac1e-fffdf91b3334 9/27/2016 11:54 AM 5b6165a7-454c-4af4-a59e-ab2a35839b2c 8/11/2015 8:17 PM

That is not closing, that is crashing.

The numbers you posted are not submitted to the Mozilla servers. Also, they are over a month old.

Do you have any crash reports for the last few weeks?

In the address bar, type about:crashes<enter>. Note: If any reports do not have BP- in front of the numbers/letters, click it to submit them.

The crash report is several pages of data. We need the report numbers to see the whole report.

Using your mouse, mark the most recent 7 - 10 crash reports, and copy them. Now go to the reply box and paste them in.

For more help on crash reports, see; https://support.mozilla.org/en-US/kb/firefox-crashes-asking-support

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?