When I hit tab on a form I get message "at least 2 windows have to be opened before you can merge them"

It seems that anytime I hit the tab key on a web page with a form, like to move the cursor between first name and last name for example a message appears at the top of the web page display area that says "at least 2 windows have to be opened before you can merge them".
I have to assume this is the result of an add-on or option change I've made but I cannot find it. If anyone has any idea what might be causing this behavior I would really appreciate any help resolving it.
Regards,
Kelly E Major

Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
If it works in Safe Mode and in normal mode with all extensions (Firefox/Tools > Add-ons > Extensions) disabled then try to find which extension is causing it by enabling one extension at a time until the problem reappears.
Close and restart Firefox after each change via "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: Firefox > Quit Firefox; Linux: Firefox/File > Quit)

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