My Firefox window will not stay highlighted.

It doesn't matter what website I am on. Every 5 seconds or so the color changes on the top blue bar. I can be in the middle of typing something (like this) and then it stops like it is inactive. I have to click on the page to start typing again.
== This happened ==
Every time Firefox opened
== Just noticed it a few days ago, not sure why?

Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
You can use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

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    print.printer_Microsoft_XPS_Document_Writer.print_bgimages false
    print.printer_Microsoft_XPS_Document_Writer.print_command
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    print.printer_Microsoft_XPS_Document_Writer.print_pagedelay 500
    print.printer_Microsoft_XPS_Document_Writer.print_paper_data 1
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    print.printer_Microsoft_XPS_Document_Writer.print_paper_size_type 0
    print.printer_Microsoft_XPS_Document_Writer.print_paper_size_unit 0
    print.printer_Microsoft_XPS_Document_Writer.print_paper_width 8.50
    print.printer_Microsoft_XPS_Document_Writer.print_reversed false
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    print.printer_Microsoft_XPS_Document_Writer.print_shrink_to_fit false
    print.printer_Microsoft_XPS_Document_Writer.print_to_file false
    print.printer_Microsoft_XPS_Document_Writer.print_unwriteable_margin_bottom 0
    print.printer_Microsoft_XPS_Document_Writer.print_unwriteable_margin_left 0
    print.printer_Microsoft_XPS_Document_Writer.print_unwriteable_margin_right 0
    print.printer_Microsoft_XPS_Document_Writer.print_unwriteable_margin_top 0
    privacy.popups.showBrowserMessage false
    privacy.sanitize.migrateFx3Prefs true
    privacy.sanitize.timeSpan 2
    security.enable_ssl2 true
    security.enable_tls false
    security.warn_viewing_mixed false
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    ==
    3.6.4
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