Sorry to hear about the crashes. If you are getting the Mozilla Crash Reporter form, your Firefox may have logged some data that would help track down the cause of the problem. You can submit that data to Mozilla and share it with forum volunteers to see whether it points to the solution. Please check the support article "Firefox crashes - asking for support" for steps to get those crash report IDs from the about:crashes page (or from disk), and then post some of the recent ones here.

Regarding Firefox not unloading from the Task Manager, please allow 15-60 seconds. Also, is it the firefox.exe process on the Processes tab, or a service on the Services tab? Firefox normally doesn't run as a service.

Here are the crashes and yes. it is not services but processes where there firefox runs after I exit

Report ID Date Submitted 964fa698-f6c5-45e6-ab5e-7bc8ba04a0d4 12/28/2016 5:24 PM bp-e490ae31-3f84-45dd-aef9-6ff8b2161228 12/28/2016 4:10 PM bp-b9c9719c-0291-4452-881e-0b62e2161228 12/28/2016 4:10 PM bp-dbb28e64-d250-4077-bf89-2fbab2161228 12/28/2016 4:09 PM bp-ec25a0d2-f38d-4ca1-a8e1-ff1fb2161228 12/28/2016 1:00 PM 05ccaedf-f475-4de1-baa3-b551c11bc5ae 12/27/2016 4:06 PM 4e68e65e-4436-469a-aae7-f3e3980d0eb8 12/26/2016 6:55 PM 6390094b-5af1-4580-941f-040b560cc828 12/26/2016 4:32 PM 72cfb9dc-d98a-4ffa-8f47-f0e61e2237dc 12/26/2016 2:22 PM

Hi ram100, four of those were automatically turned into links so I checked those reports. The first is a Flash crash from Firefox 41, so I'm going to disregard that. The next three are Firefox 50.1.0 crashes with the signature "[@ IPCError-browser | ShutDownKill ]" which I have not seen before.

IPC refers to interprocess communications, so this may be an issue with the new Multiprocess features of Firefox 48 and higher. Let's try to make sure that is disabled.

How long can you run Firefox? Only a minute or two? This is what I want you to try to do interactively in Firefox. If time does not permit, we'll have to try a file edit.

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful.

To get here faster, you could try starting Firefox by pasting
firefox.exe "about:config"
in the Start menu search box and pressing Enter to run it.

(2) In the search box above the list, type or paste autos and pause while the list is filtered

(3) Double-click the browser.tabs.remote.autostart.2 preference to switch the value from true to false

Note: the exact name of the preference may vary, but it will start with browser.tabs.remote.autostart

Then Exit Firefox using either File > Exit or the power button on the graphical application menu.

If you changed from true to false, any difference on the next Firefox startup?

The procedure you provided worked to eliminate firefox from continuing to run as a process even when I exit. However, I continue to get "hung up" when searching where firefox goes to "not responding" and I have to shut down using task manager. Again, this never happened to me until I upgraded to 50.1. Any ideas would be appreciated.

Are you searching on a site that has basic results pages (not too many images and videos)?

Does anything in this article help: Firefox hangs or is not responding - How to fix (please don't use Reset/Refresh at this stage)

Hi None of the suggestions work. The problem started when I upgraded to 50.1 so the problem is with the new version of firefox. would i be able to go back to the former version i had which worked fine?

Could you describe the problem in more detail? What search site are you using and when does the problem occur? For example, trying to get search results, trying to load one of the results, etc.

How long does the Not Responding period last -- more than 15 seconds?

Could you test in Firefox's Safe Mode? In Safe Mode, Firefox temporarily deactivates extensions, hardware acceleration, and some other advanced features to help you assess whether these are causing the problem.

If Firefox is not running: Hold down the Shift key when starting Firefox.

If Firefox is running: You can restart Firefox in Safe Mode using either:

• "3-bar" menu button > "?" button > Restart with Add-ons Disabled
• Help menu > Restart with Add-ons Disabled

and OK the restart.

Both scenarios: A small dialog should appear. Click "Start in Safe Mode" (not Refresh).

Any improvement?

Regarding the earlier version, perhaps it was 50.0.2. You usually can view your version update history on the Troubleshooting Information page in the first table. Either:

• "3-bar" menu button > "?" button > Troubleshooting Information
• (menu bar) Help > Troubleshooting Information
• type or paste about:support in the address bar and press Enter

You can check for issues caused by plugins.

• set plugins to "Ask to Activate" on the about:addons page ("3-bar" menu button or Tools -> Add-ons -> Plugins)
• plugins are not affected by Firefox Safe Mode

• https://support.mozilla.org/kb/Troubleshooting+plugins

The previous version is 50.0.2. Sorry but none of your suggestions worked. I tried safe mode and it immediately crashed. I will ask again- how can i go back to the previous version. Oh- I tried using internet explorer and it works fine with no crashes

You can usually install an earlier version of Firefox "over" your existing installation, assuming key files didn't change format in between. I don't think that's a problem for Firefox 50.0.2.

There are links in this article to access old versions: Install an older version of Firefox.