Try a refresh:

The Refresh feature (called "Reset" in older Firefox versions) can fix many issues by restoring Firefox to its factory default state while saving your bookmarks, history, passwords, cookies, and other essential information.

Note: When you use this feature, you will lose any extensions, toolbar customizations, and some preferences. See the Refresh Firefox - reset add-ons and settings article for more information.

To Refresh Firefox:

1. Open the Troubleshooting Information page using one of these methods:
   • Click the menu button , click help and select Troubleshooting Information. A new tab containing your troubleshooting information should open.
   • If you're unable to access the Help menu, type about:support in your address bar to bring up the Troubleshooting Information page.
2. At the top right corner of the page, you should see a button that says "Refresh Firefox" ("Reset Firefox" in older Firefox versions). Click on it.
3. Firefox will close. After the refresh process is completed, Firefox will show a window with the information that is imported.
4. Click Finish and Firefox will reopen.

Did this fix the problem? Please report back to us!

Thank you.

Refreshing Firefox {web link} is a LAST RESORT ! !

Refreshing Firefox -- easily fix most problems

If you're having problems with Firefox, refreshing it can help. The refresh feature fixes many issues by restoring Firefox to its factory default state while saving your essential information like bookmarks and open tabs. Everything else, like user settings and add-ons, are removed.

Product Firefox Release Channel release Version 57.0.4 Build ID 20180103231032 OS Windows 10 OS Version 10.0.14393

bp-4d1e2219-76e8-4a7a-aa40-e9a4d1180113 Signature: AsyncFunctionPromiseReactionJob

mbae64.dll = Malwarebytes Anti-Exploit

Update Malwarebytes. If the problem continues, disable it.

Thanks Mkll!

Thanks everyone for a quick and helpful response! Kudos and have a great evening. This is really appreciated. A special shoutout to Fred McD - I didn't know that Malwarebytes could cause such problems. Have a great evening! Thanks! Acheo022

Glad to help. Safe Surfing.