Seems like my Control or Alt keys are "on" after browsing with Firefox and I have to control-click or alt-click on the desktop to set things back to normal

After a browsing session using Firefox, my system behaves like either the Contol key or Alt key is stuck "on". For example if I start clicking icons on my desktop, each one is highlighted and "added" as if I were holding down the control key while clicking on each one (thus selecting all the icons). If I physically press the control key and click, then click again without the control key down, the system then behaves as normal.

Use "Firefox/File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit") to close Firefox if you are currently doing that by clicking the close X on the title bar.
Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
*https://support.mozilla.org/kb/Troubleshooting+plugins

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