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Try 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.

refresh does Not correct problem. A reinstall does fix it, until I run Chrome, at which point it gives Gah. Your tab just crashed.

srchp

type about:config in address bar and search for browser.tabs.remote.autostart and double click to change it to false

Thank you. Problem appears corrected browser.tabs.remote.autostart changed to FALSE

srchp

Note that setting this pref to false disables multi-process windows.

• https://support.mozilla.org/en-US/kb/performance-settings

I will reset browser.tabs.remote.autostart to true with the next Firefox release

 P.S.  the beta release did NOT fix the problem

Thanks again srchp